PointConverter 類別

定義

Point 物件從某一個資料型別轉換為另一個資料型別。Converts a Point object from one data type to another.

public ref class PointConverter : System::ComponentModel::TypeConverter
public class PointConverter : System.ComponentModel.TypeConverter
type PointConverter = class
    inherit TypeConverter
Public Class PointConverter
Inherits TypeConverter
繼承
PointConverter

範例

下列程式碼範例示範如何使用PointConverter Subtraction和運算子。The following code example demonstrates how to use the PointConverter and the Subtraction operator. 這個範例是設計來與 Windows Forms 搭配使用。This example is designed to be used with Windows Forms. 將此程式碼貼入表單, 並ShowPointConverter在處理表單的Paint事件時呼叫方法e , PaintEventArgs傳遞為。Paste this code into a form and call the ShowPointConverter method when handling the form's Paint event, passing e as PaintEventArgs .

void ShowPointConverter( PaintEventArgs^ e )
{
   // Create the PointConverter.
   System::ComponentModel::TypeConverter^ converter = System::ComponentModel::TypeDescriptor::GetConverter( Point::typeid );
   Point point1 =  *dynamic_cast<Point^>(converter->ConvertFromString( "200, 200" ));

   // Use the subtraction operator to get a second point.
   Point point2 = point1 - System::Drawing::Size( 190, 190 );

   // Draw a line between the two points.
   e->Graphics->DrawLine( Pens::Black, point1, point2 );
}
private void ShowPointConverter(PaintEventArgs e)
{

    // Create the PointConverter.
    System.ComponentModel.TypeConverter converter = 
        System.ComponentModel.TypeDescriptor.GetConverter(typeof(Point));

    Point point1 = (Point) converter.ConvertFromString("200, 200");

    // Use the subtraction operator to get a second point.
    Point point2 = point1 - new Size(190, 190);

    // Draw a line between the two points.
    e.Graphics.DrawLine(Pens.Black, point1, point2);
}
Private Sub ShowPointConverter(ByVal e As PaintEventArgs)

    ' Create the PointConverter.
    Dim converter As System.ComponentModel.TypeConverter = _
        System.ComponentModel.TypeDescriptor.GetConverter(GetType(Point))

    Dim point1 As Point = _
        CType(converter.ConvertFromString("200, 200"), Point)

    ' Use the subtraction operator to get a second point.
    Dim point2 As Point = Point.op_Subtraction(point1, _
        New Size(190, 190))

    ' Draw a line between the two points.
    e.Graphics.DrawLine(Pens.Black, point1, point2)
End Sub

備註

類別通常用於為具有類型Point之屬性的控制項建立設計階段體驗, 並用於將點轉換成字串, 以便在設計工具中顯示, 以及將設計工具中輸入的字串轉換為PointConverter Point物件。The PointConverter class is typically used for creating a design-time experience for controls that have properties that are of type Point, and is used to convert points to strings for display in a designer and to convert strings entered in a designer to a Point object. 這個類別可透過 TypeDescriptor 物件來存取。Access this class through the TypeDescriptor object.

建構函式

PointConverter()

初始化 PointConverter 類別的新執行個體。Initializes a new instance of the PointConverter class.

方法

CanConvertFrom(ITypeDescriptorContext, Type)

判斷這個轉換子是否可以將指定來源型別中的物件轉換成轉換子的原生型別。Determines if this converter can convert an object in the given source type to the native type of the converter.

CanConvertFrom(Type)

傳回值,指出這個轉換子是否可將指定之型別的物件轉換為這個轉換子的型別。Returns whether this converter can convert an object of the given type to the type of this converter.

(繼承來源 TypeConverter)
CanConvertTo(ITypeDescriptorContext, Type)

取得值,表示這個轉換子是否可以使用內容將物件轉換成指定的目的型別。Gets a value indicating whether this converter can convert an object to the given destination type using the context.

CanConvertTo(Type)

傳回值,指出這個轉換子是否可以將物件轉換成指定的型別。Returns whether this converter can convert the object to the specified type.

(繼承來源 TypeConverter)
ConvertFrom(ITypeDescriptorContext, CultureInfo, Object)

將指定的物件轉換為 Point 物件。Converts the specified object to a Point object.

ConvertFrom(Object)

會將指定值轉換為這個轉換子的型別。Converts the given value to the type of this converter.

(繼承來源 TypeConverter)
ConvertFromInvariantString(ITypeDescriptorContext, String)

會使用不區分的文化特性和指定的內容,將指定的字串轉換為這個轉換子的型別。Converts the given string to the type of this converter, using the invariant culture and the specified context.

(繼承來源 TypeConverter)
ConvertFromInvariantString(String)

會使用不因文化特性而異,將指定字串轉換為這個轉換子的型別。Converts the given string to the type of this converter, using the invariant culture.

(繼承來源 TypeConverter)
ConvertFromString(ITypeDescriptorContext, CultureInfo, String)

會使用指定內容和文化特性資訊,將指定文字轉換為物件。Converts the given text to an object, using the specified context and culture information.

(繼承來源 TypeConverter)
ConvertFromString(ITypeDescriptorContext, String)

會使用指定的內容,將指定文字轉換為物件。Converts the given text to an object, using the specified context.

(繼承來源 TypeConverter)
ConvertFromString(String)

會將指定的文字轉換成物件。Converts the specified text to an object.

(繼承來源 TypeConverter)
ConvertTo(ITypeDescriptorContext, CultureInfo, Object, Type)

將指定的物件轉換成指定的型別。Converts the specified object to the specified type.

ConvertTo(Object, Type)

會使用引數,將指定值物件轉換成指定型別。Converts the given value object to the specified type, using the arguments.

(繼承來源 TypeConverter)
ConvertToInvariantString(ITypeDescriptorContext, Object)

會使用指定的內容,將指定值轉換成不因文化特性而異的字串表示。Converts the specified value to a culture-invariant string representation, using the specified context.

(繼承來源 TypeConverter)
ConvertToInvariantString(Object)

會將指定值轉換成不因文化特性而異的字串表示。Converts the specified value to a culture-invariant string representation.

(繼承來源 TypeConverter)
ConvertToString(ITypeDescriptorContext, CultureInfo, Object)

會使用指定的內容和文化特性資訊,將指定值轉換為字串表示。Converts the given value to a string representation, using the specified context and culture information.

(繼承來源 TypeConverter)
ConvertToString(ITypeDescriptorContext, Object)

會使用指定的內容,將指定值轉換為字串表示。Converts the given value to a string representation, using the given context.

(繼承來源 TypeConverter)
ConvertToString(Object)

會將指定值轉換成字串表示。Converts the specified value to a string representation.

(繼承來源 TypeConverter)
CreateInstance(IDictionary)

重新建立 Object,需為物件提供一組屬性值。Re-creates an Object given a set of property values for the object.

(繼承來源 TypeConverter)
CreateInstance(ITypeDescriptorContext, IDictionary)

建立為物件提供一組屬性值的這個物件的執行個體。Creates an instance of this type given a set of property values for the object.

Equals(Object)

判斷指定的物件是否等於目前的物件。Determines whether the specified object is equal to the current object.

(繼承來源 Object)
GetConvertFromException(Object)

無法執行轉換時,會傳回要擲回的例外狀況。Returns an exception to throw when a conversion cannot be performed.

(繼承來源 TypeConverter)
GetConvertToException(Object, Type)

無法執行轉換時,會傳回要擲回的例外狀況。Returns an exception to throw when a conversion cannot be performed.

(繼承來源 TypeConverter)
GetCreateInstanceSupported()

傳回值,指出在這個物件上變更值時是否需要呼叫 CreateInstance(IDictionary) 方法來建立新值。Returns whether changing a value on this object requires a call to the CreateInstance(IDictionary) method to create a new value.

(繼承來源 TypeConverter)
GetCreateInstanceSupported(ITypeDescriptorContext)

判斷在這個物件上變更值是否需要呼叫 CreateInstance(ITypeDescriptorContext, IDictionary) 來建立新的值。Determines if changing a value on this object should require a call to CreateInstance(ITypeDescriptorContext, IDictionary) to create a new value.

GetHashCode()

做為預設雜湊函式。Serves as the default hash function.

(繼承來源 Object)
GetProperties(ITypeDescriptorContext, Object)

會使用指定的內容,傳回由值參數所指定之陣列型別的屬性集合。Returns a collection of properties for the type of array specified by the value parameter, using the specified context.

(繼承來源 TypeConverter)
GetProperties(ITypeDescriptorContext, Object, Attribute[])

擷取這個型別的屬性集。Retrieves the set of properties for this type. 根據預設值,型別不傳回任何屬性。By default, a type does not return any properties.

GetProperties(Object)

傳回由值參數所指定之陣列型別的屬性集合。Returns a collection of properties for the type of array specified by the value parameter.

(繼承來源 TypeConverter)
GetPropertiesSupported()

傳回值,指出這個物件是否支援屬性。Returns whether this object supports properties.

(繼承來源 TypeConverter)
GetPropertiesSupported(ITypeDescriptorContext)

判斷這個物件是否支援屬性。Determines if this object supports properties. 根據預設,這是 falseBy default, this is false.

GetStandardValues()

從為這個型別轉換子所設計的資料型別預設內容中,會傳回標準值的集合。Returns a collection of standard values from the default context for the data type this type converter is designed for.

(繼承來源 TypeConverter)
GetStandardValues(ITypeDescriptorContext)

當有提供格式內容時,會傳回這個型別轉換子設計之資料型別的標準值集合。Returns a collection of standard values for the data type this type converter is designed for when provided with a format context.

(繼承來源 TypeConverter)
GetStandardValuesExclusive()

傳回值,這個值表示從 GetStandardValues() 所傳回的標準值集合是否為獨佔清單。Returns whether the collection of standard values returned from GetStandardValues() is an exclusive list.

(繼承來源 TypeConverter)
GetStandardValuesExclusive(ITypeDescriptorContext)

會使用指定的內容,傳回從 GetStandardValues() 所傳回的標準值集合是否為可能值的獨佔清單。Returns whether the collection of standard values returned from GetStandardValues() is an exclusive list of possible values, using the specified context.

(繼承來源 TypeConverter)
GetStandardValuesSupported()

會傳回這個物件是否支援可以從清單中挑選的標準值組。Returns whether this object supports a standard set of values that can be picked from a list.

(繼承來源 TypeConverter)
GetStandardValuesSupported(ITypeDescriptorContext)

會使用指定的內容傳回,這個物件是否支援可從清單中挑選的標準值集合。Returns whether this object supports a standard set of values that can be picked from a list, using the specified context.

(繼承來源 TypeConverter)
GetType()

取得目前執行個體的 TypeGets the Type of the current instance.

(繼承來源 Object)
IsValid(ITypeDescriptorContext, Object)

會傳回指定值物件是否對這個型別和指定的內容有效。Returns whether the given value object is valid for this type and for the specified context.

(繼承來源 TypeConverter)
IsValid(Object)

會傳回指定值物件是否對這個型別有效。Returns whether the given value object is valid for this type.

(繼承來源 TypeConverter)
MemberwiseClone()

建立目前 Object 的淺層複本 (Shallow Copy)。Creates a shallow copy of the current Object.

(繼承來源 Object)
SortProperties(PropertyDescriptorCollection, String[])

排序屬性的集合。Sorts a collection of properties.

(繼承來源 TypeConverter)
ToString()

傳回代表目前物件的字串。Returns a string that represents the current object.

(繼承來源 Object)

適用於