Type.GetMethod 方法

定义

获取当前 Type 的特定方法。Gets a specific method of the current Type.

重载

GetMethod(String, Int32, BindingFlags, Binder, CallingConventions, Type[], ParameterModifier[])
GetMethod(String, BindingFlags, Binder, CallingConventions, Type[], ParameterModifier[])

用指定的绑定约束和指定的调用约定,搜索参数与指定的参数类型及修饰符相匹配的指定方法。Searches for the specified method whose parameters match the specified argument types and modifiers, using the specified binding constraints and the specified calling convention.

GetMethod(String, Int32, BindingFlags, Binder, Type[], ParameterModifier[])
GetMethod(String, BindingFlags, Binder, Type[], ParameterModifier[])

使用指定绑定约束,搜索其参数与指定参数类型及修饰符匹配的指定方法。Searches for the specified method whose parameters match the specified argument types and modifiers, using the specified binding constraints.

GetMethod(String, Int32, Type[], ParameterModifier[])
GetMethod(String, Type[])

搜索其参数与指定参数类型匹配的指定公共方法。Searches for the specified public method whose parameters match the specified argument types.

GetMethod(String, Int32, Type[])
GetMethod(String, BindingFlags)

使用指定绑定约束搜索指定方法。Searches for the specified method, using the specified binding constraints.

GetMethod(String)

搜索具有指定名称的公共方法。Searches for the public method with the specified name.

GetMethod(String, Type[], ParameterModifier[])

搜索其参数与指定参数类型及修饰符匹配的指定公共方法。Searches for the specified public method whose parameters match the specified argument types and modifiers.

GetMethod(String, Int32, BindingFlags, Binder, CallingConventions, Type[], ParameterModifier[])

public:
 System::Reflection::MethodInfo ^ GetMethod(System::String ^ name, int genericParameterCount, System::Reflection::BindingFlags bindingAttr, System::Reflection::Binder ^ binder, System::Reflection::CallingConventions callConvention, cli::array <Type ^> ^ types, cli::array <System::Reflection::ParameterModifier> ^ modifiers);
public System.Reflection.MethodInfo GetMethod (string name, int genericParameterCount, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Reflection.CallingConventions callConvention, Type[] types, System.Reflection.ParameterModifier[] modifiers);
member this.GetMethod : string * int * System.Reflection.BindingFlags * System.Reflection.Binder * System.Reflection.CallingConventions * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.MethodInfo

参数

name
String
genericParameterCount
Int32
bindingAttr
BindingFlags
binder
Binder
callConvention
CallingConventions
types
Type[]
modifiers
ParameterModifier[]

返回

GetMethod(String, BindingFlags, Binder, CallingConventions, Type[], ParameterModifier[])

用指定的绑定约束和指定的调用约定,搜索参数与指定的参数类型及修饰符相匹配的指定方法。Searches for the specified method whose parameters match the specified argument types and modifiers, using the specified binding constraints and the specified calling convention.

public:
 virtual System::Reflection::MethodInfo ^ GetMethod(System::String ^ name, System::Reflection::BindingFlags bindingAttr, System::Reflection::Binder ^ binder, System::Reflection::CallingConventions callConvention, cli::array <Type ^> ^ types, cli::array <System::Reflection::ParameterModifier> ^ modifiers);
public System.Reflection.MethodInfo GetMethod (string name, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Reflection.CallingConventions callConvention, Type[] types, System.Reflection.ParameterModifier[] modifiers);
abstract member GetMethod : string * System.Reflection.BindingFlags * System.Reflection.Binder * System.Reflection.CallingConventions * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.MethodInfo
override this.GetMethod : string * System.Reflection.BindingFlags * System.Reflection.Binder * System.Reflection.CallingConventions * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.MethodInfo

参数

name
String

包含要获取的方法名称的字符串。The string containing the name of the method to get.

bindingAttr
BindingFlags

枚举值的按位组合,这些值指定如何进行搜索。A bitwise combination of the enumeration values that specify how the search is conducted.

- 或 --or- 若为 Default,则返回 nullDefault to return null.

binder
Binder

一个对象,该对象定义一组属性并启用绑定,而绑定可能涉及选择重载方法、强制参数类型和通过反射调用成员。An object that defines a set of properties and enables binding, which can involve selection of an overloaded method, coercion of argument types, and invocation of a member through reflection.

- 或 --or- 要使用 Nothing 的空引用(在 Visual Basic 中为 DefaultBinder)。A null reference (Nothing in Visual Basic), to use the DefaultBinder.

callConvention
CallingConventions

该对象用于指定要使用的一套规则,这些规则涉及自变量的顺序和布局、传递返回值的方式、用于自变量的寄存器和清理堆栈的方式。The object that specifies the set of rules to use regarding the order and layout of arguments, how the return value is passed, what registers are used for arguments, and how the stack is cleaned up.

types
Type[]

表示此方法要获取的参数的个数、顺序和类型的 Type 对象数组。An array of Type objects representing the number, order, and type of the parameters for the method to get.

-or- 空的 Type 对象数组(由 EmptyTypes 字段提供),用来获取不采用参数的方法。An empty array of Type objects (as provided by the EmptyTypes field) to get a method that takes no parameters.

modifiers
ParameterModifier[]

ParameterModifier 对象的数组,表示与 types 数组中的相应元素关联的特性。An array of ParameterModifier objects representing the attributes associated with the corresponding element in the types array. 仅当通过 COM 互操作进行调用时才使用,而且仅处理通过引用传递的参数。To be only used when calling through COM interop, and only parameters that are passed by reference are handled. 默认的联编程序不处理此参数。The default binder does not process this parameter.

返回

表示符合指定要求的方法的对象(如果找到的话);否则为 nullAn object representing the method that matches the specified requirements, if found; otherwise, null.

实现

异常

找到多个具有指定名称且与指定绑定约束匹配的方法。More than one method is found with the specified name and matching the specified binding constraints.

namenullname is null.

- 或 --or- typesnulltypes is null.

-or- types 的其中一个元素为 nullOne of the elements in types is null.

types 是多维的。types is multidimensional.

-or- modifiers 是多维的。modifiers is multidimensional.

示例

下面的示例查找的MethodA特定重载,指定绑定约束、调用约定和各种参数类型。The following example finds specific overloads of MethodA, specifying binding constraints, calling conventions, and a variety of argument types.

备注

Visual C# 2005Visual C# 2005 示例/unsafe需要编译器选项。The Visual C# 2005Visual C# 2005 example requires the /unsafe compiler option.

using namespace System;
using namespace System::Reflection;

public ref class Program
{

public:
    // Methods to get:

    void MethodA(int i, int j) { }

    void MethodA(array<int>^ iarry) { }

    void MethodA(double *ip) { }

    // Method that takes a managed reference paramter.
    void MethodA(int% r) {}
};

int main()
{
    MethodInfo^ mInfo;


    // Get MethodA(int i, int j)
    mInfo = Program::typeid->GetMethod("MethodA",
        BindingFlags::Public | BindingFlags::Instance,
        nullptr,
        CallingConventions::Any,
        gcnew array<Type^> {int::typeid, int::typeid},
        nullptr);
    Console::WriteLine("Found method: {0}", mInfo );

    // Get  MethodA(array<int>^ iarry)
    mInfo = Program::typeid->GetMethod("MethodA",
        BindingFlags::Public | BindingFlags::Instance,
        nullptr,
        CallingConventions::Any,
        gcnew array<Type^> {int::typeid->MakeArrayType()},
        nullptr);
    Console::WriteLine("Found method: {0}", mInfo );

    // Get MethodA(double *ip)
    mInfo = Program::typeid->GetMethod("MethodA",
        BindingFlags::Public | BindingFlags::Instance,
        nullptr,
        CallingConventions::Any,
        gcnew array<Type^> {double::typeid->MakePointerType()},
        nullptr);
    Console::WriteLine("Found method: {0}", mInfo );

    // Get MethodA(int% r)
    mInfo = Program::typeid->GetMethod("MethodA",
        BindingFlags::Public | BindingFlags::Instance,
        nullptr,
        CallingConventions::Any,
        gcnew array<Type^> {int::typeid->MakeByRefType()},
        nullptr);
    Console::WriteLine("Found method: {0}", mInfo );

}

using System;
using System.Reflection;

class Program
{
    // Methods to get:

    public void MethodA(int i, int j) { }

    public void MethodA(int[] i) { }

    public unsafe void MethodA(int* i) { }

    public void MethodA(ref int r) {}

    // Method that takes an out parameter:
    public void MethodA(int i, out int o) { o = 100;}


  static void Main(string[] args)
  {
    MethodInfo mInfo;

    // Get MethodA(int i, int j)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        CallingConventions.Any,
        new Type[] { typeof(int), typeof(int) },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(int[] i)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        CallingConventions.Any,
        new Type[] { typeof(int[]) },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(int* i)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        CallingConventions.Any,
        new Type[] { typeof(int).MakePointerType() },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(ref int r)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        CallingConventions.Any,
        new Type[] { typeof(int).MakeByRefType() },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(int i, out int o)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        CallingConventions.Any,
        new Type[] { typeof(int), typeof(int).MakeByRefType() },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

  }
}

Imports System.Reflection
Imports System.Runtime.InteropServices

Class Program

    ' Methods to get:
    
    Public Overloads Sub MethodA(ByVal i As Integer, ByVal l As Long)

    End Sub

    Public Overloads Sub MethodA(ByVal i() As Integer)

    End Sub

    Public Overloads Sub MethodA(ByRef r As Integer)

    End Sub

    ' Method that takes an integer and an out parameter. Note that an
    ' Imports reference is needed to System.Runtime.InteropServices
    ' for the <OutAttribute>, which can be shortened to <Out>.
    Public Overloads Sub MethodA(ByVal i As Integer, <Out()> ByRef o As Integer)
        o = 100
    End Sub

    Public Shared Sub Main(ByVal args() As String)
        Dim mInfo As MethodInfo

        ' Get MethodA(ByVal i As Integer, ByVal l As Long)
        mInfo = GetType(Program).GetMethod("MethodA", _
            BindingFlags.Public Or BindingFlags.Instance, _
            Nothing, _
            CallingConventions.Any, _
            New Type() {GetType(System.Int32), _
            GetType(System.Int64)}, _
            Nothing)
        Console.WriteLine("Found method: {0}", mInfo)

        ' Get  MethodA(ByVal i() As Integer)
        mInfo = GetType(Program).GetMethod("MethodA", _
            BindingFlags.Public Or BindingFlags.Instance, _
            Nothing, _
            CallingConventions.Any, _
            New Type() {GetType(System.Int32())}, _
            Nothing)
        Console.WriteLine("Found method: {0}", mInfo)

        ' Get MethodA(ByRef r As Integer)
        mInfo = GetType(Program).GetMethod("MethodA", _
        BindingFlags.Public Or BindingFlags.Instance, _
        Nothing, _
        CallingConventions.Any, _
        New Type() {GetType(System.Int32).MakeByRefType}, _
        Nothing)
        Console.WriteLine("Found method: {0}", mInfo)

        ' Get MethodA(ByVal i As Integer, <Out()> ByRef o As Integer)
        mInfo = GetType(Program).GetMethod("MethodA", _
        BindingFlags.Public Or BindingFlags.Instance, _
        Nothing, _
        CallingConventions.Any, _
        New Type() {GetType(System.Int32), GetType(System.Int32).MakeByRefType}, _
        Nothing)
        Console.WriteLine("Found method: {0}", mInfo)

    End Sub
End Class

注解

尽管默认的联编程序不处理ParameterModifier modifiers (参数),但您可以使用抽象System.Reflection.Binder类编写处理modifiers的自定义联编程序。Although the default binder does not process ParameterModifier (the modifiers parameter), you can use the abstract System.Reflection.Binder class to write a custom binder that does process modifiers. ParameterModifier仅在通过 COM 互操作进行调用时使用,并且仅处理通过引用传递的参数。ParameterModifier is only used when calling through COM interop, and only parameters that are passed by reference are handled.

下表显示了在类型上反射时GetXXX方法返回的基类成员。The following table shows what members of a base class are returned by the GetXXX methods when reflecting on a type.

成员类型Member Type StaticStatic 非静态Non-Static
构造函数Constructor NoNo NoNo
字段Field NoNo 可以。Yes. 字段始终按名称和签名隐藏。A field is always hide-by-name-and-signature.
事件Event 不适用Not applicable 通用类型系统规则是指继承与实现属性的方法相同。The common type system rule is that the inheritance is the same as that of the methods that implement the property. 反射将属性视为隐藏的名称和签名。Reflection treats properties as hide-by-name-and-signature. 请参阅下面的注释2。See note 2 below.
方法Method NoNo 可以。Yes. 方法(虚拟和非虚拟)可按名称隐藏或按名称和签名隐藏。A method (both virtual and non-virtual) can be hide-by-name or hide-by-name-and-signature.
嵌套类型Nested Type NoNo NoNo
PropertyProperty 不适用Not applicable 通用类型系统规则是指继承与实现属性的方法相同。The common type system rule is that the inheritance is the same as that of the methods that implement the property. 反射将属性视为隐藏的名称和签名。Reflection treats properties as hide-by-name-and-signature. 请参阅下面的注释2。See note 2 below.
  1. 按名称和签名隐藏将考虑签名的所有部分,包括自定义修饰符、返回类型、参数类型、个 sentinel 和非托管调用约定。Hide-by-name-and-signature considers all of the parts of the signature, including custom modifiers, return types, parameter types, sentinels, and unmanaged calling conventions. 这是二进制比较。This is a binary comparison.

  2. 对于反射,属性和事件是按名称和签名隐藏的。For reflection, properties and events are hide-by-name-and-signature. 如果在基类中同时具有 get 访问器和 set 访问器的属性,但派生类只有 get 访问器,则派生类属性将隐藏基类属性,并且你将无法访问基类的资源库。If you have a property with both a get and a set accessor in the base class, but the derived class has only a get accessor, the derived class property hides the base class property, and you will not be able to access the setter on the base class.

  3. 自定义属性不属于通用类型系统。Custom attributes are not part of the common type system.

以下BindingFlags筛选器标志可用于定义要包括在搜索中的方法:The following BindingFlags filter flags can be used to define which methods to include in the search:

  • 必须指定BindingFlags.InstanceBindingFlags.Static才能获取返回。You must specify either BindingFlags.Instance or BindingFlags.Static in order to get a return.

  • 指定BindingFlags.Public在搜索中包含公共方法。Specify BindingFlags.Public to include public methods in the search.

  • 指定BindingFlags.NonPublic在搜索中包含非公共方法(即私有方法、内部方法和受保护的方法)。Specify BindingFlags.NonPublic to include nonpublic methods (that is, private, internal, and protected methods) in the search.

  • 指定BindingFlags.FlattenHierarchy在层次public结构protected中包含和静态成员;private不包括继承类中的静态成员。Specify BindingFlags.FlattenHierarchy to include public and protected static members up the hierarchy; private static members in inherited classes are not included.

以下BindingFlags修饰符标志可用于更改搜索的工作方式:The following BindingFlags modifier flags can be used to change how the search works:

  • BindingFlags.IgnoreCase如果忽略,则为nameBindingFlags.IgnoreCase to ignore the case of name.

  • BindingFlags.DeclaredOnly仅搜索在上Type声明的方法,而不搜索简单继承的方法。BindingFlags.DeclaredOnly to search only the methods declared on the Type, not methods that were simply inherited.

有关更多信息,请参见System.Reflection.BindingFlagsSee System.Reflection.BindingFlags for more information.

备注

在查找构造函数和方法时,不能忽略参数。You cannot omit parameters when looking up constructors and methods. 在调用时,只能省略参数。You can only omit parameters when invoking.

如果当前Type表示构造泛型类型,则此方法将MethodInfo返回,并将类型参数替换为相应的类型参数。If the current Type represents a constructed generic type, this method returns the MethodInfo with the type parameters replaced by the appropriate type arguments.

如果当前Type表示泛型类型或泛型方法的定义中的类型参数,则此方法会搜索类约束的方法, Object如果没有类约束,则搜索的方法。If the current Type represents a type parameter in the definition of a generic type or generic method, this method searches the methods of the class constraint, or the methods of Object if there is no class constraint.

备注

对于泛型方法,请不要在中name包括类型参数。For generic methods, do not include the type arguments in name. 例如, C#代码GetMember("MyMethod<int>")将搜索文本名称为 "MyMethod<int>" 的成员,而不是使用一个类型int的泛型参数MyMethod的名为的方法。For example, the C# code GetMember("MyMethod<int>") searches for a member with the text name "MyMethod<int>", rather than for a method named MyMethod that has one generic argument of type int.

另请参阅

GetMethod(String, Int32, BindingFlags, Binder, Type[], ParameterModifier[])

public:
 System::Reflection::MethodInfo ^ GetMethod(System::String ^ name, int genericParameterCount, System::Reflection::BindingFlags bindingAttr, System::Reflection::Binder ^ binder, cli::array <Type ^> ^ types, cli::array <System::Reflection::ParameterModifier> ^ modifiers);
public System.Reflection.MethodInfo GetMethod (string name, int genericParameterCount, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, Type[] types, System.Reflection.ParameterModifier[] modifiers);
member this.GetMethod : string * int * System.Reflection.BindingFlags * System.Reflection.Binder * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.MethodInfo

参数

name
String
genericParameterCount
Int32
bindingAttr
BindingFlags
binder
Binder
types
Type[]
modifiers
ParameterModifier[]

返回

GetMethod(String, BindingFlags, Binder, Type[], ParameterModifier[])

使用指定绑定约束,搜索其参数与指定参数类型及修饰符匹配的指定方法。Searches for the specified method whose parameters match the specified argument types and modifiers, using the specified binding constraints.

public:
 virtual System::Reflection::MethodInfo ^ GetMethod(System::String ^ name, System::Reflection::BindingFlags bindingAttr, System::Reflection::Binder ^ binder, cli::array <Type ^> ^ types, cli::array <System::Reflection::ParameterModifier> ^ modifiers);
public System.Reflection.MethodInfo GetMethod (string name, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, Type[] types, System.Reflection.ParameterModifier[] modifiers);
abstract member GetMethod : string * System.Reflection.BindingFlags * System.Reflection.Binder * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.MethodInfo
override this.GetMethod : string * System.Reflection.BindingFlags * System.Reflection.Binder * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.MethodInfo

参数

name
String

包含要获取的方法名称的字符串。The string containing the name of the method to get.

bindingAttr
BindingFlags

枚举值的按位组合,这些值指定如何进行搜索。A bitwise combination of the enumeration values that specify how the search is conducted.

-or- 若为 Default,则返回 nullDefault to return null.

binder
Binder

一个对象,该对象定义一组属性并启用绑定,而绑定可能涉及选择重载方法、强制参数类型和通过反射调用成员。An object that defines a set of properties and enables binding, which can involve selection of an overloaded method, coercion of argument types, and invocation of a member through reflection.

-or- 要使用 Nothing 的空引用(在 Visual Basic 中为 DefaultBinder)。A null reference (Nothing in Visual Basic), to use the DefaultBinder.

types
Type[]

表示此方法要获取的参数的个数、顺序和类型的 Type 对象数组。An array of Type objects representing the number, order, and type of the parameters for the method to get.

-or- 空的 Type 对象数组(由 EmptyTypes 字段提供),用来获取不采用参数的方法。An empty array of Type objects (as provided by the EmptyTypes field) to get a method that takes no parameters.

modifiers
ParameterModifier[]

ParameterModifier 对象的数组,表示与 types 数组中的相应元素关联的特性。An array of ParameterModifier objects representing the attributes associated with the corresponding element in the types array. 仅当通过 COM 互操作进行调用时才使用,而且仅处理通过引用传递的参数。To be only used when calling through COM interop, and only parameters that are passed by reference are handled. 默认的联编程序不处理此参数。The default binder does not process this parameter.

返回

表示符合指定要求的方法的对象(如果找到的话);否则为 nullAn object representing the method that matches the specified requirements, if found; otherwise, null.

实现

异常

找到多个具有指定名称且与指定绑定约束匹配的方法。More than one method is found with the specified name and matching the specified binding constraints.

namenullname is null.

-or- typesnulltypes is null.

-or- types 的其中一个元素为 nullOne of the elements in types is null.

types 是多维的。types is multidimensional.

-or- modifiers 是多维的。modifiers is multidimensional.

示例

下面的示例查找的MethodA特定重载,并指定绑定约束和各种参数类型。The following example finds specific overloads of MethodA, specifying binding constraints and a variety of argument types.

备注

Visual C# 2005Visual C# 2005 示例/unsafe需要编译器选项。The Visual C# 2005Visual C# 2005 example requires the /unsafe compiler option.

using namespace System;
using namespace System::Reflection;

public ref class Program
{

public:
    // Methods to get:

    void MethodA(int i, int j) { }

    void MethodA(array<int>^ iarry) { }

    void MethodA(double *ip) { }

    // Method that takes a managed reference parameter.
    void MethodA(int% r) {}
};

int main()
{
    MethodInfo^ mInfo;


    // Get MethodA(int i, int j)
    mInfo = Program::typeid->GetMethod("MethodA",
        static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance),
        nullptr,
        gcnew array<Type^> {int::typeid, int::typeid},
        nullptr);
    Console::WriteLine("Found method: {0}", mInfo );

    // Get  MethodA(array<int>^ iarry)
    mInfo = Program::typeid->GetMethod("MethodA",
        static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance),
        nullptr,
        gcnew array<Type^> {int::typeid->MakeArrayType()},
        nullptr);
    Console::WriteLine("Found method: {0}", mInfo );

    // Get MethodA(double *ip)
    mInfo = Program::typeid->GetMethod("MethodA",
        static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance),
        nullptr,
        gcnew array<Type^> {double::typeid->MakePointerType()},
        nullptr);
    Console::WriteLine("Found method: {0}", mInfo );

    // Get MethodA(int% r)
    mInfo = Program::typeid->GetMethod("MethodA",
        static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance),
        nullptr,
        gcnew array<Type^> {int::typeid->MakeByRefType()},
        nullptr);
    Console::WriteLine("Found method: {0}", mInfo );
}

using System;
using System.Reflection;

class Program
{
    // Methods to get:

    public void MethodA(int i, int j) { }

    public void MethodA(int[] i) { }

    public unsafe void MethodA(int* i) { }


    public void MethodA(ref int r) {}

    // Method that takes an out parameter.
    public void MethodA(int i, out int o) { o = 100; }


  static void Main(string[] args)
  {
    MethodInfo mInfo;

    // Get MethodA(int i, int j)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        new Type[] { typeof(int), typeof(int) },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(int[] i)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        new Type[] { typeof(int[]) },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(int* i)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        new Type[] { typeof(int).MakePointerType() },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(ref int r)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        new Type[] { typeof(int).MakeByRefType() },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(int i, out int o)
    mInfo = typeof(Program).GetMethod("MethodA",
        BindingFlags.Public | BindingFlags.Instance,
        null,
        new Type[] { typeof(int), typeof(int).MakeByRefType() },
        null);
    Console.WriteLine("Found method: {0}", mInfo);

  }
}

Imports System.Reflection
Imports System.Runtime.InteropServices

Class Program

    ' Methods to get:
    
    Public Overloads Sub MethodA(ByVal i As Integer, ByVal l As Long)

    End Sub

    Public Overloads Sub MethodA(ByVal i() As Integer)

    End Sub

    Public Overloads Sub MethodA(ByRef r As Integer)

    End Sub

    ' Method that takes an out parameter. Note that an Imports
    ' reference is needed to System.Runtime.InteropServices 
    ' for the <OutAttribute>, which can be shortened to <Out>.
    Public Overloads Sub MethodA(ByVal i As Integer, <Out()> ByRef o As Integer)
        o = 100
    End Sub

    Public Shared Sub Main(ByVal args() As String)
        Dim mInfo As MethodInfo

        ' Get MethodA(ByVal i As Integer, ByVal l As Long)
        mInfo = GetType(Program).GetMethod("MethodA", _
            BindingFlags.Public Or BindingFlags.Instance, _
            Nothing, _
            New Type() {GetType(System.Int32), _
            GetType(System.Int64)}, _
            Nothing)
        Console.WriteLine("Found method: {0}", mInfo)

        ' Get MethodA(ByVal i() As Integer)
        mInfo = GetType(Program).GetMethod("MethodA", _
            BindingFlags.Public Or BindingFlags.Instance, _
            Nothing, _
            New Type() {GetType(System.Int32())}, _
            Nothing)
        Console.WriteLine("Found method: {0}", mInfo)

        ' Get MethodA(ByRef r As Integer)
        mInfo = GetType(Program).GetMethod("MethodA", _
            BindingFlags.Public Or BindingFlags.Instance, _
            Nothing, _
            New Type() {GetType(System.Int32).MakeByRefType}, _
            Nothing)
        Console.WriteLine("Found method: {0}", mInfo)

        ' Get MethodA(ByVal i As Integer, <Out()> ByRef o As Integer)
        mInfo = GetType(Program).GetMethod("MethodA", _
            BindingFlags.Public Or BindingFlags.Instance, _
            Nothing, _
            New Type() {GetType(System.Int32), GetType(System.Int32).MakeByRefType}, _
            Nothing)
        Console.WriteLine("Found method: {0}", mInfo)

    End Sub
End Class

注解

尽管默认的联编程序不处理ParameterModifier modifiers (参数),但您可以使用抽象System.Reflection.Binder类编写处理modifiers的自定义联编程序。Although the default binder does not process ParameterModifier (the modifiers parameter), you can use the abstract System.Reflection.Binder class to write a custom binder that does process modifiers. ParameterModifier仅在通过 COM 互操作进行调用时使用,并且仅处理通过引用传递的参数。ParameterModifier is only used when calling through COM interop, and only parameters that are passed by reference are handled.

以下BindingFlags筛选器标志可用于定义要包括在搜索中的方法:The following BindingFlags filter flags can be used to define which methods to include in the search:

  • 必须指定BindingFlags.InstanceBindingFlags.Static才能获取返回。You must specify either BindingFlags.Instance or BindingFlags.Static in order to get a return.

  • 指定BindingFlags.Public在搜索中包含公共方法。Specify BindingFlags.Public to include public methods in the search.

  • 指定BindingFlags.NonPublic在搜索中包含非公共方法(即私有方法、内部方法和受保护的方法)。Specify BindingFlags.NonPublic to include nonpublic methods (that is, private, internal, and protected methods) in the search.

  • 指定BindingFlags.FlattenHierarchy在层次public结构protected中包含和静态成员;private不包括继承类中的静态成员。Specify BindingFlags.FlattenHierarchy to include public and protected static members up the hierarchy; private static members in inherited classes are not included.

以下BindingFlags修饰符标志可用于更改搜索的工作方式:The following BindingFlags modifier flags can be used to change how the search works:

  • BindingFlags.IgnoreCase如果忽略,则为nameBindingFlags.IgnoreCase to ignore the case of name.

  • BindingFlags.DeclaredOnly仅搜索在上Type声明的方法,而不搜索简单继承的方法。BindingFlags.DeclaredOnly to search only the methods declared on the Type, not methods that were simply inherited.

有关更多信息,请参见System.Reflection.BindingFlagsSee System.Reflection.BindingFlags for more information.

备注

在查找构造函数和方法时,不能忽略参数。You cannot omit parameters when looking up constructors and methods. 在调用时,只能省略参数。You can only omit parameters when invoking.

如果当前Type表示构造泛型类型,则此方法将MethodInfo返回,并将类型参数替换为相应的类型参数。If the current Type represents a constructed generic type, this method returns the MethodInfo with the type parameters replaced by the appropriate type arguments.

如果当前Type表示泛型类型或泛型方法的定义中的类型参数,则此方法会搜索类约束的方法, Object如果没有类约束,则搜索的方法。If the current Type represents a type parameter in the definition of a generic type or generic method, this method searches the methods of the class constraint, or the methods of Object if there is no class constraint.

备注

对于泛型方法,请不要在中name包括类型参数。For generic methods, do not include the type arguments in name. 例如, C#代码GetMember("MyMethod<int>")将搜索文本名称为 "MyMethod<int>" 的成员,而不是使用一个类型int的泛型参数MyMethod的名为的方法。For example, the C# code GetMember("MyMethod<int>") searches for a member with the text name "MyMethod<int>", rather than for a method named MyMethod that has one generic argument of type int.

另请参阅

GetMethod(String, Int32, Type[], ParameterModifier[])

public:
 System::Reflection::MethodInfo ^ GetMethod(System::String ^ name, int genericParameterCount, cli::array <Type ^> ^ types, cli::array <System::Reflection::ParameterModifier> ^ modifiers);
public System.Reflection.MethodInfo GetMethod (string name, int genericParameterCount, Type[] types, System.Reflection.ParameterModifier[] modifiers);
member this.GetMethod : string * int * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.MethodInfo
Public Function GetMethod (name As String, genericParameterCount As Integer, types As Type(), modifiers As ParameterModifier()) As MethodInfo

参数

name
String
genericParameterCount
Int32
types
Type[]
modifiers
ParameterModifier[]

返回

GetMethod(String, Type[])

搜索其参数与指定参数类型匹配的指定公共方法。Searches for the specified public method whose parameters match the specified argument types.

public:
 virtual System::Reflection::MethodInfo ^ GetMethod(System::String ^ name, cli::array <Type ^> ^ types);
public System.Reflection.MethodInfo GetMethod (string name, Type[] types);
abstract member GetMethod : string * Type[] -> System.Reflection.MethodInfo
override this.GetMethod : string * Type[] -> System.Reflection.MethodInfo
Public Function GetMethod (name As String, types As Type()) As MethodInfo

参数

name
String

包含要获取的公共方法的名称的字符串。The string containing the name of the public method to get.

types
Type[]

表示此方法要获取的参数的个数、顺序和类型的 Type 对象数组。An array of Type objects representing the number, order, and type of the parameters for the method to get.

-or- 空的 Type 对象数组(由 EmptyTypes 字段提供),用来获取不采用参数的方法。An empty array of Type objects (as provided by the EmptyTypes field) to get a method that takes no parameters.

返回

表示其参数与指定参数类型匹配的公共方法的对象(如果找到的话);否则为 nullAn object representing the public method whose parameters match the specified argument types, if found; otherwise, null.

实现

异常

找到了多个具有指定名称和指定参数的方法。More than one method is found with the specified name and specified parameters.

namenullname is null.

- 或 --or- typesnulltypes is null.

-or- types 的其中一个元素为 nullOne of the elements in types is null.

types 是多维的。types is multidimensional.

示例

下面的示例查找的MethodA特定重载,并指定各种参数类型。The following example finds specific overloads of MethodA, specifying a variety of argument types.

备注

Visual C# 2005Visual C# 2005 示例/unsafe需要编译器选项。The Visual C# 2005Visual C# 2005 example requires the /unsafe compiler option.

using namespace System;
using namespace System::Reflection;

public ref class Program
{

public:
    // Methods to get:

    void MethodA(int i, int j) { }

    void MethodA(array<int>^ iarry) { }

    void MethodA(double *ip) { }

    // Method that takes a managed reference parameter.
    void MethodA(int% r) {}
};

int main()
{
    MethodInfo^ mInfo;


    // Get MethodA(int i, int j)
    mInfo = Program::typeid->GetMethod("MethodA", gcnew array<Type^> {int::typeid,int::typeid});
    Console::WriteLine("Found method: {0}", mInfo );

    // Get MethodA(array<int>^ iarry)
    mInfo = Program::typeid->GetMethod("MethodA", gcnew array<Type^> {int::typeid->MakeArrayType()});
    Console::WriteLine("Found method: {0}", mInfo );

    // Get MethodA(double *ip)
    mInfo = Program::typeid->GetMethod("MethodA", gcnew array<Type^> {double::typeid->MakePointerType()});
    Console::WriteLine("Found method: {0}", mInfo );

    // Get MethodA(int% r)
    mInfo = Program::typeid->GetMethod("MethodA", gcnew array<Type^> {int::typeid->MakeByRefType()});
    // Display the method information.
    Console::WriteLine("Found method: {0}", mInfo );

}

using System;
using System.Reflection;

class Program
{
    // Methods to get:

    public void MethodA(int i, int j) { }

    public void MethodA(int[] i) { }

    public unsafe void MethodA(int* i) { }

    public void MethodA(ref int r) {}

    // Method that takes an out parameter:
    public void MethodA(int i, out int o) { o = 100;}


  static void Main(string[] args)
  {
    MethodInfo mInfo;

    // Get MethodA(int i, int i)
    mInfo = typeof(Program).GetMethod("MethodA",
        new Type[] { typeof(int), typeof(int) });
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(int[] i)
    mInfo = typeof(Program).GetMethod("MethodA",
        new Type[] { typeof(int[]) });
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(int* i)
    mInfo = typeof(Program).GetMethod("MethodA",
        new Type[] { typeof(int).MakePointerType() });
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(ref int r)
    mInfo = typeof(Program).GetMethod("MethodA",
        new Type[] { typeof(int).MakeByRefType() });
    Console.WriteLine("Found method: {0}", mInfo);

    // Get MethodA(int i, out int o)
    mInfo = typeof(Program).GetMethod("MethodA",
        new Type[] { typeof(int), typeof(int).MakeByRefType() });
    Console.WriteLine("Found method: {0}", mInfo);

  }
}

Imports System.Reflection
Imports System.Runtime.InteropServices

Class Program

    ' Methods to get:

    Public Overloads Sub MethodA(ByVal i As Integer, ByVal l As Long)

    End Sub

    Public Overloads Sub MethodA(ByVal i() As Integer)

    End Sub

    Public Overloads Sub MethodA(ByRef r As Integer)

    End Sub

    ' Method that takes an out parameter. Note that an Imports
    ' reference is needed to System.Runtime.InteropServices 
    ' for the <OutAttribute>, which can be shortened to <Out>.
    Public Overloads Sub MethodA(ByVal i As Integer, <Out()> ByRef o As Integer)
        o = 100
    End Sub

    Public Shared Sub Main(ByVal args() As String)
        Dim mInfo As MethodInfo

        ' Get MethodA(i As Integer i, l As Long)
        mInfo = GetType(Program).GetMethod("MethodA", New Type() {GetType(Integer), GetType(Long)})
        Console.WriteLine("Found method: {0}", mInfo)

        ' Get  MethodA(i As Integer())
        mInfo = GetType(Program).GetMethod("MethodA", New Type() {GetType(Integer())})
        Console.WriteLine("Found method: {0}", mInfo)

        ' Get MethodA(ByRef r As Integer)
        mInfo = GetType(Program).GetMethod("MethodA", New Type() {GetType(Integer).MakeByRefType})
        Console.WriteLine("Found method: {0}", mInfo)

        ' Get MethodA(i As Integer, ByRef r As Integer)
        mInfo = GetType(Program).GetMethod("MethodA", New Type() {GetType(Integer), _
            GetType(Integer).MakeByRefType})
        Console.WriteLine("Found method: {0}", mInfo)

    End Sub
End Class

下面的示例检索MethodInfo Add表示非泛型类型( ArrayListList<T> )、开放式泛型类型(类)和封闭式泛型类型( List(Of String)类型)的方法的对象。The following example retrieves MethodInfo objects that represent the Add methods of a non-generic type (the ArrayList class), an open generic type (the List<T> class), and a closed generic type (the List(Of String) type.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;

public class Example
{
   public static void Main()
   {
      // Get a Type object that represents a non-generic type.
      GetAddMethod(typeof(ArrayList));

      var list = new List<String>();
      // Get a Type object that represents a constructed generic type.
      Type closed = list.GetType();
      GetAddMethod(closed);
      
      // Get a Type object that represents an open generic type.
      Type open = typeof(List<>);
      GetAddMethod(open);
   }

   private static void GetAddMethod(Type typ)
   {
      MethodInfo method;
      // Determine if this is a generic type.
      if (typ.IsGenericType) {
         // Is it an open generic type?
         if (typ.ContainsGenericParameters)
            method = typ.GetMethod("Add", typ.GetGenericArguments());
         // Get closed generic type arguments.
         else
            method = typ.GetMethod("Add", typ.GenericTypeArguments);
      }
      // This is not a generic type.
      else {
         method = typ.GetMethod("Add", new Type[] { typeof(Object) } );
      }

      // Test if an Add method was found.
      if (method == null) { 
         Console.WriteLine("No Add method found.");
         return;
      }   
      
      Type t = method.ReflectedType;
      Console.Write("{0}.{1}.{2}(", t.Namespace, t.Name, method.Name);
      ParameterInfo[] parms = method.GetParameters();
      for (int ctr = 0; ctr < parms.Length; ctr++)
         Console.Write("{0}{1}", parms[ctr].ParameterType.Name, 
                       ctr < parms.Length - 1 ? ", " : "");

      Console.WriteLine(")");
   }   
}
// The example displays the following output:
//       System.Collections.ArrayList.Add(Object)
//       System.Collections.Generic.List`1.Add(String)
//       System.Collections.Generic.List`1.Add(T)
Imports System.Collections
Imports System.Collections.Generic
Imports System.Reflection

Module Example
   Public Sub Main()
      ' Get a Type object that represents a non-generic type.
      GetAddMethod(GetType(ArrayList))
      
      Dim list As New List(Of String)()
      ' Get a Type object that represents a constructed generic type.
      Dim closed As Type = list.GetType()
      GetAddMethod(closed)
      
      ' Get a Type object that represents an open generic type.
      Dim open As Type = GetType(List(Of))
      GetAddMethod(open)
   End Sub
   
   Private Sub GetAddMethod(typ As Type)
      Dim method As MethodInfo
      ' Determine if this is a generic type.
      If typ.IsGenericType Then
         ' Is it an open generic type?
         If typ.ContainsGenericParameters Then
            method = typ.GetMethod("Add", typ.GetGenericArguments())
         ' Get closed generic type arguments.
         Else
            method = typ.GetMethod("Add", typ.GenericTypeArguments)
         End If
      ' This is not a generic type.
      Else
         method = typ.GetMethod("Add", { GetType(Object) } )
      End If
      ' Test if an Add method was found.
      If method Is Nothing Then 
         Console.WriteLine("No Add method found.")
         Exit Sub
      End If   

      Dim t As Type = method.ReflectedType
      Console.Write("{0}.{1}.{2}(", t.Namespace, t.Name, method.Name)
      Dim params() As ParameterInfo = method.GetParameters()
      For ctr As Integer = 0 To params.Length - 1
         Console.Write("{0}{1}", params(ctr).ParameterType.Name, 
                       If(ctr < params.Length - 1, ", ", ""))
      Next
      Console.WriteLine(")")
   End Sub
End Module
' The example displays the following output:
'       System.Collections.ArrayList.Add(Object)
'       System.Collections.Generic.List`1.Add(String)
'       System.Collections.Generic.List`1.Add(T)

该示例定义了GetAddMethod一个检索相应MethodInfo对象的方法。The example defines a GetAddMethod method that retrieves the appropriate MethodInfo object. 为了提供开放式types泛型类型的参数,它将Type.GetGenericArguments调用方法。To provide the types argument for an open generic type, it calls the Type.GetGenericArguments method. 为提供封闭式types泛型类型的参数,它将检索Type.GenericTypeArguments属性的值。To provide the types argument for a closed generic type, it retrieves the value of the Type.GenericTypeArguments property.

注解

的搜索name区分大小写。The search for name is case-sensitive. 搜索包括公共静态和公共实例方法。The search includes public static and public instance methods.

备注

在查找构造函数和方法时,不能忽略参数。You cannot omit parameters when looking up constructors and methods. 在调用时,只能省略参数。You can only omit parameters when invoking.

如果当前Type表示构造泛型类型,则此方法将MethodInfo返回,并将类型参数替换为相应的类型参数。If the current Type represents a constructed generic type, this method returns the MethodInfo with the type parameters replaced by the appropriate type arguments.

如果当前Type表示泛型类型或泛型方法的定义中的类型参数,则此方法会搜索类约束的方法, Object如果没有类约束,则搜索的方法。If the current Type represents a type parameter in the definition of a generic type or generic method, this method searches the methods of the class constraint, or the methods of Object if there is no class constraint.

备注

name参数不能包括类型参数。The name parameter cannot include type arguments. 例如, C#代码GetMethod("MyGenericMethod<int>")搜索文本名称为 "MyGenericMethod<int>" 的方法,而不是使用一个类型int的泛型参数的MyGenericMethod名为的方法。For example, the C# code GetMethod("MyGenericMethod<int>") searches for a method with the text name "MyGenericMethod<int>", rather than for a method named MyGenericMethod that has one generic argument of type int. 应将与GetMethod("MyGenericMethod") types数组中的相应参数一起使用。Instead, use GetMethod("MyGenericMethod") with the appropriate parameter in the types array.

另请参阅

GetMethod(String, Int32, Type[])

public:
 System::Reflection::MethodInfo ^ GetMethod(System::String ^ name, int genericParameterCount, cli::array <Type ^> ^ types);
public System.Reflection.MethodInfo GetMethod (string name, int genericParameterCount, Type[] types);
member this.GetMethod : string * int * Type[] -> System.Reflection.MethodInfo
Public Function GetMethod (name As String, genericParameterCount As Integer, types As Type()) As MethodInfo

参数

name
String
genericParameterCount
Int32
types
Type[]

返回

GetMethod(String, BindingFlags)

使用指定绑定约束搜索指定方法。Searches for the specified method, using the specified binding constraints.

public:
 virtual System::Reflection::MethodInfo ^ GetMethod(System::String ^ name, System::Reflection::BindingFlags bindingAttr);
public System.Reflection.MethodInfo GetMethod (string name, System.Reflection.BindingFlags bindingAttr);
abstract member GetMethod : string * System.Reflection.BindingFlags -> System.Reflection.MethodInfo
override this.GetMethod : string * System.Reflection.BindingFlags -> System.Reflection.MethodInfo
Public Function GetMethod (name As String, bindingAttr As BindingFlags) As MethodInfo

参数

name
String

包含要获取的方法名称的字符串。The string containing the name of the method to get.

bindingAttr
BindingFlags

枚举值的按位组合,这些值指定如何进行搜索。A bitwise combination of the enumeration values that specify how the search is conducted.

- 或 --or- 若为 Default,则返回 nullDefault to return null.

返回

表示符合指定要求的方法的对象(如果找到的话);否则为 nullAn object representing the method that matches the specified requirements, if found; otherwise, null.

实现

异常

找到多个具有指定名称且与指定绑定约束匹配的方法。More than one method is found with the specified name and matching the specified binding constraints.

namenullname is null.

示例

下面的示例获取与指定的绑定标志匹配的方法。The following example gets the method that matches the specified binding flags.

using namespace System;
using namespace System::Reflection;
public ref class Program
{

    public:

        // Method to get:
        void MethodA() { }

    };

    int main()
    {

        // Get MethodA()
        MethodInfo^ mInfo = Program::typeid->GetMethod("MethodA",
            static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance));
        Console::WriteLine("Found method: {0}", mInfo );

    }

using System;
using System.Reflection;

class Program
{

    // Method to get:
    public void MethodA() { }


    static void Main(string[] args)
    {

        // Get MethodA()
        MethodInfo mInfo = typeof(Program).GetMethod("MethodA",
            BindingFlags.Public | BindingFlags.Instance);
        Console.WriteLine("Found method: {0}", mInfo);

    }
}

Imports System.Reflection

Class Program

    ' Method to get:
    Public Sub MethodA()
    End Sub


    Public Shared Sub Main(ByVal args() As String)

        ' Get MethodA()
        Dim mInfo As MethodInfo = GetType(Program).GetMethod("MethodA", _
            BindingFlags.Public Or BindingFlags.Instance)
        Console.WriteLine("Found method: {0}", mInfo)

    End Sub
End Class

注解

以下BindingFlags筛选器标志可用于定义要包括在搜索中的方法:The following BindingFlags filter flags can be used to define which methods to include in the search:

以下BindingFlags修饰符标志可用于更改搜索的工作方式:The following BindingFlags modifier flags can be used to change how the search works:

有关更多信息,请参见System.Reflection.BindingFlagsSee System.Reflection.BindingFlags for more information.

如果重载方法,并且多个重载满足bindingAttr参数所指定的约束,则该方法将AmbiguousMatchException引发异常。If a method is overloaded and more than one overload meets the constraints specified by the bindingAttr argument, the method throws an AmbiguousMatchException exception. 在下面的示例中,引发了异常,因为:In the following example, an exception is thrown because:

  • TestClass类型具有两个DisplayValue方法的公共实例重载: DisplayValue(String)DisplayValue(String, Object[])The TestClass type has two public instance overloads of the DisplayValue method, DisplayValue(String) and DisplayValue(String, Object[]).

  • TestClass类型具有Equals方法的两个公共实例重载,其中一个派生自ObjectEquals(TestClass)Equals(Object)The TestClass type has two public instance overloads of the Equals method, one of which is inherited from Object: Equals(TestClass) and Equals(Object).

using System;
using System.Reflection;

public class TestClass
{
   public void DisplayValue(String s)
   {
      Console.WriteLine(s);
   }
   
   public void DisplayValue(String s, params Object[] values)
   {
      Console.WriteLine(s, values);
   }
   
   public static bool Equals(TestClass t1, TestClass t2)
   {
      return Object.ReferenceEquals(t1, t2);
   }
   
   public bool Equals(TestClass t) 
   {
      return Object.ReferenceEquals(this, t);
   }          
}

public class Example
{
   public static void Main()
   {
      Type t = typeof(TestClass);
      
      RetrieveMethod(t, "DisplayValue", BindingFlags.Public | BindingFlags.Instance);

      RetrieveMethod(t, "Equals", BindingFlags.Public | BindingFlags.Instance);
      
      RetrieveMethod(t, "Equals", BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly);
      
      RetrieveMethod(t, "Equals", BindingFlags.Public | BindingFlags.Static);
   }
   
   private static void RetrieveMethod(Type t, String name, BindingFlags flags)
   {
      try {
         MethodInfo m = t.GetMethod(name, flags);
         if (m != null) {
            Console.Write("{0}.{1}(", t.Name, m.Name);
            ParameterInfo[] parms= m.GetParameters();
            for (int ctr = 0; ctr <parms.Length; ctr++) {
               Console.Write(parms[ctr].ParameterType.Name);
               if (ctr < parms.Length - 1) 
                  Console.Write(", ");

            }
            Console.WriteLine(")");
         }
         else {
            Console.WriteLine("Method not found");
         }
      }
      catch (AmbiguousMatchException) {
         Console.WriteLine("The following duplicate matches were found:");
         MethodInfo[] methods = t.GetMethods(flags);
         foreach (var method in methods) {
            if (method.Name != name) continue;

            Console.Write("   {0}.{1}(", t.Name, method.Name);
            ParameterInfo[] parms = method.GetParameters();
            for (int ctr = 0; ctr < parms.Length; ctr++) {
               Console.Write(parms[ctr].ParameterType.Name);
               if (ctr < parms.Length - 1) 
                  Console.Write(", ");

            }
            Console.WriteLine(")");
         } 
      }         
      Console.WriteLine();
   }
}
// The example displays the following output:
//       The following duplicate matches were found:
//          TestClass.DisplayValue(String)
//          TestClass.DisplayValue(String, Object[])
//       
//       The following duplicate matches were found:
//          TestClass.Equals(TestClass)
//          TestClass.Equals(Object)
//       
//       TestClass.Equals(TestClass)
//       
//       TestClass.Equals(TestClass, TestClass)
Imports System.Reflection

Public Class TestClass
   Public Sub DisplayValue(s As String)
      Console.WriteLine(s)
   End Sub
   
   Public Sub DisplayValue(s As String, ParamArray values() As Object)
      Console.WriteLine(s, values)
   End Sub
   
   Public Overloads Shared Function Equals(t1 As TestClass, t2 As TestClass) As Boolean
      Return Object.ReferenceEquals(t1, t2)
   End Function
   
   Public Overloads Function Equals(t As TestClass) As Boolean
      Return Object.ReferenceEquals(Me, t)
   End Function          
End Class

Module Example
   Public Sub Main()
      Dim t As Type = GetType(TestClass)
      
      RetrieveMethod(t, "DisplayValue", BindingFlags.Public Or BindingFlags.Instance)

      RetrieveMethod(t, "Equals", BindingFlags.Public Or BindingFlags.Instance)
      
      RetrieveMethod(t, "Equals", BindingFlags.Public Or BindingFlags.Instance Or BindingFlags.DeclaredOnly)
      
      RetrieveMethod(t, "Equals", BindingFlags.Public Or BindingFlags.Static)
   End Sub
   
   Public Sub RetrieveMethod(t As Type, name As String, flags As BindingFlags)
      Try
         Dim m As MethodInfo = t.GetMethod(name, flags)
         If m IsNot Nothing Then
            Console.Write("{0}.{1}(", t.Name, m.Name)
           Dim parms() As ParameterInfo = m.GetParameters()
            For ctr As Integer = 0 To parms.Length - 1
               Console.Write(parms(ctr).ParameterType.Name)
               if ctr < parms.Length - 1 Then 
                  Console.Write(", ")
               End If      
            Next
            Console.WriteLine(")")
         Else
            Console.WriteLine("Method not found")
         End If
      Catch e As AmbiguousMatchException
         Console.WriteLine("The following duplicate matches were found:")
         Dim methods() As MethodInfo = t.GetMethods(flags)
         For Each method In methods
            If method.Name <> name Then Continue For

            Console.Write("   {0}.{1}(", t.Name, method.Name)
            Dim parms() As ParameterInfo = method.GetParameters()
            For ctr As Integer = 0 To parms.Length - 1
               Console.Write(parms(ctr).ParameterType.Name)
               if ctr < parms.Length - 1 Then 
                  Console.Write(", ")
               End If      
            Next
            Console.WriteLine(")")
         Next 
      End Try         
      Console.WriteLine()
   End Sub
End Module
' The example displays the following output:
'       The following duplicate matches were found:
'          TestClass.DisplayValue(String)
'          TestClass.DisplayValue(String, Object[])
'       
'       The following duplicate matches were found:
'          TestClass.Equals(TestClass)
'          TestClass.Equals(Object)
'       
'       TestClass.Equals(TestClass)
'       
'       TestClass.Equals(TestClass, TestClass)

可以执行以下操作之一来检索特定方法:You can do one of the following to retrieve a specific method:

  • 更改绑定约束。Change the binding constraints. 在前面的示例中,尝试检索由类型声明Equals的公共实例方法,而不是成功检索。 Equals(TestClass)In the previous example, attempting to retrieve a public instance Equals method that is declared by the type and not inherited successfully retrieves Equals(TestClass).

  • GetMethod 调用types包含参数的方法的重载,该参数定义方法的参数的类型。Call an overload of the GetMethod method that includes a types parameter which defines the types of the method's parameters.

  • GetMethods(BindingFlags)调用方法以检索一个数组,该数组包含属于具有指定绑定特性的类型的所有方法。Call the GetMethods(BindingFlags) method to retrieve an array containing all of the methods belonging to a type that have the specified binding attributes. 然后,你可以对其进行循环访问以识别name名为的重复方法。You can then iterate it to identify the duplicate methods named name. 此方法在上一个示例的AmbiguousMatchException异常处理程序中进行了说明。This approach is illustrated in the previous example's handler for the AmbiguousMatchException exception.

如果当前Type表示构造泛型类型,则此方法将MethodInfo返回,并将类型参数替换为相应的类型参数。If the current Type represents a constructed generic type, this method returns the MethodInfo with the type parameters replaced by the appropriate type arguments.

如果当前Type表示泛型类型或泛型方法的定义中的类型参数,则此方法会搜索类约束的方法, Object如果没有类约束,则搜索的方法。If the current Type represents a type parameter in the definition of a generic type or generic method, this method searches the methods of the class constraint, or the methods of Object if there is no class constraint.

备注

对于泛型方法,请不要在中name包括类型参数。For generic methods, do not include the type arguments in name. 例如, C#代码GetMember("MyMethod<int>")将搜索文本名称为 "MyMethod<int>" 的成员,而不是使用一个类型int的泛型参数MyMethod的名为的方法。For example, the C# code GetMember("MyMethod<int>") searches for a member with the text name "MyMethod<int>", rather than for a method named MyMethod that has one generic argument of type int.

另请参阅

GetMethod(String)

搜索具有指定名称的公共方法。Searches for the public method with the specified name.

public:
 virtual System::Reflection::MethodInfo ^ GetMethod(System::String ^ name);
public System.Reflection.MethodInfo GetMethod (string name);
abstract member GetMethod : string -> System.Reflection.MethodInfo
override this.GetMethod : string -> System.Reflection.MethodInfo
Public Function GetMethod (name As String) As MethodInfo

参数

name
String

包含要获取的公共方法的名称的字符串。The string containing the name of the public method to get.

返回

表示具有指定名称的公共方法的对象(如果找到的话);否则为 nullAn object that represents the public method with the specified name, if found; otherwise, null.

实现

异常

找到了多个具有指定名称的方法。More than one method is found with the specified name.

namenullname is null.

示例

下面的示例获取名为MethodA的方法。The following example gets a method named MethodA.

using namespace System;
using namespace System::Reflection;
public ref class Program
{

    public:

        // Method to get:
        void MethodA() { }

    };

    int main()
    {

        // Get MethodA()
        MethodInfo^ mInfo = Program::typeid->GetMethod("MethodA");
        Console::WriteLine("Found method: {0}", mInfo );

    }

using System;
using System.Reflection;

class Program
{

    // Method to get:
    public void MethodA() { }


    static void Main(string[] args)
    {

        // Get MethodA()
        MethodInfo mInfo = typeof(Program).GetMethod("MethodA");
        Console.WriteLine("Found method: {0}", mInfo);

    }
}

Imports System.Reflection

Class Program

    ' Method to get:
    Public Sub MethodA()
    End Sub


    Public Shared Sub Main(ByVal args() As String)

        ' Get MethodA()
        Dim mInfo As MethodInfo = GetType(Program).GetMethod("MethodA")
        Console.WriteLine("Found method: {0}", mInfo)

    End Sub
End Class

注解

的搜索name区分大小写。The search for name is case-sensitive. 搜索包括公共静态和公共实例方法。The search includes public static and public instance methods.

如果重载了方法并且有多个公共方法,该GetMethod(String)方法将AmbiguousMatchException引发异常。If a method is overloaded and has more than one public method, the GetMethod(String) method throws an AmbiguousMatchException exception. 在下面的示例中,引发了异常,因为有多个Int32.ToString方法的公共重载。In the following example, an exception is thrown because there is more than one public overload of the Int32.ToString method. 另一方面,因为Person.ToString方法会重写Object.ToString ,因此不GetMethod(String)会重载,所以方法可以检索MethodInfo对象。On the other hand, because the Person.ToString method overrides Object.ToString and therefore is not overloaded, the GetMethod(String) method is able to retrieve the MethodInfo object.

using System;
using System.Reflection;

public class Person
{
   public String FirstName;
   public String LastName;
   
   public override String ToString()
   {
      return (FirstName + " " + LastName).Trim();
   }
}

public class Example
{
   public static void Main()
   {
      Type t = typeof(Person);
      RetrieveMethod(t, "ToString");
      
      t = typeof(Int32);
      RetrieveMethod(t, "ToString");
   }

   private static void RetrieveMethod(Type t, String name)
   {   
      try {
         MethodInfo m = t.GetMethod(name);
         if (m != null) 
            Console.WriteLine("{0}.{1}: {2} method", m.ReflectedType.Name,
                              m.Name, m.IsStatic ? "Static" : "Instance");    
         else
            Console.WriteLine("{0}.ToString method not found", t.Name);
      }
      catch (AmbiguousMatchException) {
         Console.WriteLine("{0}.{1} has multiple public overloads.", 
                           t.Name, name);
      }
   }
}
// The example displays the following output:
//       Person.ToString: Instance method
//       Int32.ToString has multiple public overloads.
Imports System.Reflection

Public Class Person
   Public FirstName As String
   Public LastName As String
   
   Public Overrides Function ToString() As String
      Return (FirstName + " " + LastName).Trim()
   End Function
End Class

Module Example
   Public Sub Main()
      Dim t As Type = GetType(Person)
      RetrieveMethod(t, "ToString")
      
      t = GetType(Int32)
      RetrieveMethod(t, "ToString")
   End Sub
   
   Private Sub RetrieveMethod(t As Type, name As String)   
      Try
         Dim m As MethodInfo = t.GetMethod(name)
         If m IsNot Nothing Then
            Console.WriteLine("{0}.{1}: {2} method", m.ReflectedType.Name,
                              m.Name, If(m.IsStatic, "Static", "Instance"))    
         Else
            Console.WriteLine("{0}.ToString method not found", t.Name)
         End If   
      Catch e As AmbiguousMatchException
         Console.WriteLine("{0}.{1} has multiple public overloads.", 
                           t.Name, name)
      End Try
   End Sub
End Module
' The example displays the following output:
'       Person.ToString: Instance method
'       Int32.ToString has multiple public overloads.

可以执行以下操作之一来检索特定方法:You can do one of the following to retrieve a specific method:

  • 调用方法,并指定唯一bindingAttr标识该方法的参数。 GetMethod(String, BindingFlags)Call the GetMethod(String, BindingFlags) method and specify a bindingAttr argument that uniquely identifies the method. 例如,如果由于类型具有静态和实例重载而引发异常,则可以bindingAttr指定的BindingFlags.Instance Or BindingFlags.Instance参数。For example, if the exception is thrown because a type has a static and an instance overload, you can specify a bindingAttr argument of BindingFlags.InstanceOrBindingFlags.Instance.

  • GetMethod 调用types包含参数的方法的重载,该参数定义方法的参数的类型。Call an overload of the GetMethod method that includes a types parameter which defines the types of the method's parameters.

  • GetMethods()调用方法以检索包含属于某个类型的所有公共方法的数组。Call the GetMethods() method to retrieve an array containing all of the public methods belonging to a type. 然后,你可以对其进行循环访问以识别name名为的重复方法。You can then iterate it to identify the duplicate methods named name.

如果当前Type表示构造泛型类型,则此方法将MethodInfo返回,并将类型参数替换为相应的类型参数。If the current Type represents a constructed generic type, this method returns the MethodInfo with the type parameters replaced by the appropriate type arguments.

如果当前Type表示泛型类型或泛型方法的定义中的类型参数,则此方法会搜索类约束的方法, Object如果没有类约束,则搜索的方法。If the current Type represents a type parameter in the definition of a generic type or generic method, this method searches the methods of the class constraint, or the methods of Object if there is no class constraint.

备注

对于泛型方法,请不要在中name包括类型参数。For generic methods, do not include the type arguments in name. 例如, C#代码GetMember("MyMethod<int>")将搜索文本名称为 "MyMethod<int>" 的成员,而不是使用一个类型int的泛型参数MyMethod的名为的方法。For example, the C# code GetMember("MyMethod<int>") searches for a member with the text name "MyMethod<int>", rather than for a method named MyMethod that has one generic argument of type int.

另请参阅

GetMethod(String, Type[], ParameterModifier[])

搜索其参数与指定参数类型及修饰符匹配的指定公共方法。Searches for the specified public method whose parameters match the specified argument types and modifiers.

public:
 virtual System::Reflection::MethodInfo ^ GetMethod(System::String ^ name, cli::array <Type ^> ^ types, cli::array <System::Reflection::ParameterModifier> ^ modifiers);
public System.Reflection.MethodInfo GetMethod (string name, Type[] types, System.Reflection.ParameterModifier[] modifiers);
abstract member GetMethod : string * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.MethodInfo
override this.GetMethod : string * Type[] * System.Reflection.ParameterModifier[] -> System.Reflection.MethodInfo
Public Function GetMethod (name As String, types As Type(), modifiers As ParameterModifier()) As MethodInfo

参数

name
String

包含要获取的公共方法的名称的字符串。The string containing the name of the public method to get.

types
Type[]

表示此方法要获取的参数的个数、顺序和类型的 Type 对象数组。An array of Type objects representing the number, order, and type of the parameters for the method to get.

-or- 空的 Type 对象数组(由 EmptyTypes 字段提供),用来获取不采用参数的方法。An empty array of Type objects (as provided by the EmptyTypes field) to get a method that takes no parameters.

modifiers
ParameterModifier[]

ParameterModifier 对象的数组,表示与 types 数组中的相应元素关联的特性。An array of ParameterModifier objects representing the attributes associated with the corresponding element in the types array. 仅当通过 COM 互操作进行调用时才使用,而且仅处理通过引用传递的参数。To be only used when calling through COM interop, and only parameters that are passed by reference are handled. 默认的联编程序不处理此参数。The default binder does not process this parameter.

返回

表示符合指定要求的公共方法的对象(如果找到的话);否则为 nullAn object representing the public method that matches the specified requirements, if found; otherwise, null.

实现

异常

找到了多个具有指定名称和指定参数的方法。More than one method is found with the specified name and specified parameters.

namenullname is null.

- 或 --or- typesnulltypes is null.

-or- types 的其中一个元素为 nullOne of the elements in types is null.

types 是多维的。types is multidimensional.

-or- modifiers 是多维的。modifiers is multidimensional.

注解

尽管默认的联编程序不处理ParameterModifier modifiers (参数),但您可以使用抽象System.Reflection.Binder类编写处理modifiers的自定义联编程序。Although the default binder does not process ParameterModifier (the modifiers parameter), you can use the abstract System.Reflection.Binder class to write a custom binder that does process modifiers. ParameterModifier仅在通过 COM 互操作进行调用时使用,并且仅处理通过引用传递的参数。ParameterModifier is only used when calling through COM interop, and only parameters that are passed by reference are handled.

的搜索name区分大小写。The search for name is case-sensitive. 搜索包括公共静态和公共实例方法。The search includes public static and public instance methods.

备注

在查找构造函数和方法时,不能忽略参数。You cannot omit parameters when looking up constructors and methods. 在调用时,只能省略参数。You can only omit parameters when invoking.

如果当前Type表示构造泛型类型,则此方法将MethodInfo返回,并将类型参数替换为相应的类型参数。If the current Type represents a constructed generic type, this method returns the MethodInfo with the type parameters replaced by the appropriate type arguments.

如果当前Type表示泛型类型或泛型方法的定义中的类型参数,则此方法会搜索类约束的方法, Object如果没有类约束,则搜索的方法。If the current Type represents a type parameter in the definition of a generic type or generic method, this method searches the methods of the class constraint, or the methods of Object if there is no class constraint.

备注

对于泛型方法,请不要在中name包括类型参数。For generic methods, do not include the type arguments in name. 例如, C#代码GetMethod("MyMethod<int>")将搜索文本名称为 "MyMethod<int>" 的成员,而不是使用一个类型int的泛型参数MyMethod的名为的方法。For example, the C# code GetMethod("MyMethod<int>") searches for a member with the text name "MyMethod<int>", rather than for a method named MyMethod that has one generic argument of type int. 应将与GetMethod("MyMethod") types数组中的相应参数一起使用。Instead, use GetMethod("MyMethod") with the appropriate parameter in the types array.

另请参阅

适用于