DataFieldConverter 类

定义

提供类型转换器,它可从当前组件的选定数据源中检索数据字段的列表。Provides a type converter that can retrieve a list of data fields from the current component's selected data source.

public ref class DataFieldConverter : System::ComponentModel::TypeConverter
public class DataFieldConverter : System.ComponentModel.TypeConverter
type DataFieldConverter = class
    inherit TypeConverter
Public Class DataFieldConverter
Inherits TypeConverter
继承
DataFieldConverter

示例

   // Associates the DataFieldConverter with a string property.
public:
   [TypeConverterAttribute(DataMemberConverter::typeid)]
   property String^ dataField 
   {
      String^ get()
      {
         return field;
      }
      void set( String^ value )
      {
         field = value;
      }
   }
private:
   String^ field;
// Associates the DataFieldConverter with a string property.
[TypeConverterAttribute(typeof(DataMemberConverter))]
public string dataField
{
    get
    {
        return field;
    }
    set
    {
        field = value;
    }
}
private string field;
' Associates the DataFieldConverter with a string property.   
<TypeConverterAttribute(GetType(DataMemberConverter))>  _
Public Property dataField() As String
   Get
      Return field
   End Get
   Set
      field = value
   End Set
End Property
Private field As String

注解

DataFieldConverter可以从设计时组件的当前数据源中检索数据字段的列表。DataFieldConverter can retrieve a list of data fields from the current data source of a design-time component.

使用此类型转换器Visual Studio 2005Visual Studio 2005来提供在属性窗口的数据字段列表中显示的值。This type converter is used by Visual Studio 2005Visual Studio 2005 to provide the values that appear in the list of data fields in the Properties window.

注意

永远不应直接访问类型转换器。You should never access a type converter directly. 改为使用TypeDescriptor调用适当的转换器。Instead, call the appropriate converter by using TypeDescriptor. 有关详细信息, 请参阅TypeConverter基类中的示例。For more information, see the examples in the TypeConverter base class.

有关类型转换器的详细信息, 请参阅TypeConverter基类和如何:实现类型转换器For more information about type converters, see the TypeConverter base class and How to: Implement a Type Converter.

构造函数

DataFieldConverter()

初始化 DataFieldConverter 类的新实例。Initializes a new instance of the DataFieldConverter class.

方法

CanConvertFrom(ITypeDescriptorContext, Type)

获取一个值,该值指示转换器是否可以将指定源类型的对象转换为转换器的本机类型。Gets a value indicating whether the converter can convert an object of the specified source type to the native type of the converter.

CanConvertFrom(Type)

返回该转换器是否可以将给定类型的对象转换为此转换器的类型。Returns whether this converter can convert an object of the given type to the type of this converter.

(继承自 TypeConverter)
CanConvertTo(ITypeDescriptorContext, Type)

返回此转换器能否使用指定上下文将对象转换为指定类型。Returns whether this converter can convert the object to the specified type, using the specified context.

(继承自 TypeConverter)
CanConvertTo(Type)

返回此转换器是否可将该对象转换为指定的类型。Returns whether this converter can convert the object to the specified type.

(继承自 TypeConverter)
ConvertFrom(ITypeDescriptorContext, CultureInfo, Object)

将指定对象转换为转换器的本机类型。Converts the specified object to the native type of the converter.

ConvertFrom(Object)

将给定值转换为此转换器的类型。Converts the given value to the type of this converter.

(继承自 TypeConverter)
ConvertFromInvariantString(ITypeDescriptorContext, String)

使用不变区域性和指定上下文将给定字符串转换为此转换器的类型。Converts the given string to the type of this converter, using the invariant culture and the specified context.

(继承自 TypeConverter)
ConvertFromInvariantString(String)

使用不变区域性将给定字符串转换为此转换器的类型。Converts the given string to the type of this converter, using the invariant culture.

(继承自 TypeConverter)
ConvertFromString(ITypeDescriptorContext, CultureInfo, String)

使用指定的上下文和区域性信息将给定的文本转换为对象。Converts the given text to an object, using the specified context and culture information.

(继承自 TypeConverter)
ConvertFromString(ITypeDescriptorContext, String)

使用指定的上下文将给定的文本转换为对象。Converts the given text to an object, using the specified context.

(继承自 TypeConverter)
ConvertFromString(String)

将指定文本转换为对象。Converts the specified text to an object.

(继承自 TypeConverter)
ConvertTo(ITypeDescriptorContext, CultureInfo, Object, Type)

使用指定的上下文和区域性信息将给定值对象转换为指定的类型。Converts the given value object to the specified type, using the specified context and culture information.

(继承自 TypeConverter)
ConvertTo(Object, Type)

使用参数将给定的值对象转换为指定的类型。Converts the given value object to the specified type, using the arguments.

(继承自 TypeConverter)
ConvertToInvariantString(ITypeDescriptorContext, Object)

使用指定的上下文将指定的值转换为区域性不变的字符串表示形式。Converts the specified value to a culture-invariant string representation, using the specified context.

(继承自 TypeConverter)
ConvertToInvariantString(Object)

将指定值转换为区域性不变的字符串表示形式。Converts the specified value to a culture-invariant string representation.

(继承自 TypeConverter)
ConvertToString(ITypeDescriptorContext, CultureInfo, Object)

使用指定的上下文和区域性信息将给定的值转换为字符串表示形式。Converts the given value to a string representation, using the specified context and culture information.

(继承自 TypeConverter)
ConvertToString(ITypeDescriptorContext, Object)

使用给定的上下文将给定的值转换为字符串表示形式。Converts the given value to a string representation, using the given context.

(继承自 TypeConverter)
ConvertToString(Object)

将指定值转换为字符串表示形式。Converts the specified value to a string representation.

(继承自 TypeConverter)
CreateInstance(IDictionary)

在给定 Object 的一组属性值的情况下重新创建该对象。Re-creates an Object given a set of property values for the object.

(继承自 TypeConverter)
CreateInstance(ITypeDescriptorContext, IDictionary)

给定该对象的一组属性值,使用指定上下文创建与此 TypeConverter 相关联的类型的实例。Creates an instance of the type that this TypeConverter is associated with, using the specified context, given a set of property values for the object.

(继承自 TypeConverter)
Equals(Object)

确定指定的对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(继承自 Object)
GetConvertFromException(Object)

返回当转换无法执行时所引发的异常。Returns an exception to throw when a conversion cannot be performed.

(继承自 TypeConverter)
GetConvertToException(Object, Type)

返回当转换无法执行时所引发的异常。Returns an exception to throw when a conversion cannot be performed.

(继承自 TypeConverter)
GetCreateInstanceSupported()

返回更改此对象的值是否求调用 CreateInstance(IDictionary) 方法来创建新值。Returns whether changing a value on this object requires a call to the CreateInstance(IDictionary) method to create a new value.

(继承自 TypeConverter)
GetCreateInstanceSupported(ITypeDescriptorContext)

返回一个结果,即更改此对象上的某个值是否需要调用 CreateInstance(IDictionary) 以使用指定的上下文创建新值。Returns whether changing a value on this object requires a call to CreateInstance(IDictionary) to create a new value, using the specified context.

(继承自 TypeConverter)
GetHashCode()

用作默认哈希函数。Serves as the default hash function.

(继承自 Object)
GetProperties(ITypeDescriptorContext, Object)

使用指定的上下文返回值参数指定的数组类型的属性的集合。Returns a collection of properties for the type of array specified by the value parameter, using the specified context.

(继承自 TypeConverter)
GetProperties(ITypeDescriptorContext, Object, Attribute[])

使用指定的上下文和特性返回由该值参数指定的数组类型的属性集合。Returns a collection of properties for the type of array specified by the value parameter, using the specified context and attributes.

(继承自 TypeConverter)
GetProperties(Object)

返回由值参数指定的数组类型的属性集合。Returns a collection of properties for the type of array specified by the value parameter.

(继承自 TypeConverter)
GetPropertiesSupported()

返回此对象是否支持属性。Returns whether this object supports properties.

(继承自 TypeConverter)
GetPropertiesSupported(ITypeDescriptorContext)

通过使用指定的上下文,返回此对象是否支持属性。Returns whether this object supports properties, using the specified context.

(继承自 TypeConverter)
GetStandardValues()

从默认的上下文返回此类型转换器设计用于的数据类型的标准值集合。Returns a collection of standard values from the default context for the data type this type converter is designed for.

(继承自 TypeConverter)
GetStandardValues(ITypeDescriptorContext)

如果可以得到关于存在于选定数据源内的数据字段的信息,则获取这些数据字段。Gets the data fields present within the selected data source if information about them is available.

GetStandardValuesExclusive()

返回从 GetStandardValues() 返回的标准值的集合是否为独占列表。Returns whether the collection of standard values returned from GetStandardValues() is an exclusive list.

(继承自 TypeConverter)
GetStandardValuesExclusive(ITypeDescriptorContext)

获取一个值,该值指示从 GetStandardValues() 返回的标准值集合是否为所有可能值的列表。Gets a value indicating whether the collection of standard values returned from GetStandardValues() is a list of all possible values.

GetStandardValuesSupported()

返回此对象是否支持可以从列表中选取的值的标准集。Returns whether this object supports a standard set of values that can be picked from a list.

(继承自 TypeConverter)
GetStandardValuesSupported(ITypeDescriptorContext)

获取一个值,该值指示转换器是否支持可从列表中选取的一组标准值。Gets a value indicating whether the converter supports a standard set of values that can be picked from a list.

GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
IsValid(ITypeDescriptorContext, Object)

返回给定的值对象是否对此类型和对指定的上下文有效。Returns whether the given value object is valid for this type and for the specified context.

(继承自 TypeConverter)
IsValid(Object)

返回给定值对象对于此类型是否有效。Returns whether the given value object is valid for this type.

(继承自 TypeConverter)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
SortProperties(PropertyDescriptorCollection, String[])

对属性的集合进行排序。Sorts a collection of properties.

(继承自 TypeConverter)
ToString()

返回一个表示当前对象的 string。Returns a string that represents the current object.

(继承自 Object)

适用于