Szerkesztés

Megosztás a következőn keresztül:

TypeConverter.ConvertFrom Method

  • Reference

Definition

Namespace:
System.ComponentModel
Assembly:
System.ComponentModel.TypeConverter.dll
Assembly:
System.dll
Assembly:
netstandard.dll

Converts the given value to the type of this converter.

Overloads

ConvertFrom(Object)

Converts the given value to the type of this converter.
ConvertFrom(ITypeDescriptorContext, CultureInfo, Object)

Converts the given object to the type of this converter, using the specified context and culture information.

ConvertFrom(Object)

Source:
TypeConverter.cs
Source:
TypeConverter.cs
Source:
TypeConverter.cs

Converts the given value to the type of this converter.

public:
 System::Object ^ ConvertFrom(System::Object ^ value);
public object ConvertFrom (object value);
public object? ConvertFrom (object value);
member this.ConvertFrom : obj -> obj
Public Function ConvertFrom (value As Object) As Object

Parameters

value
Object

The Object to convert.

Returns

Object

An Object that represents the converted value.

Exceptions

NotSupportedException

The conversion cannot be performed.

Applies to

ConvertFrom(ITypeDescriptorContext, CultureInfo, Object)

Source:
TypeConverter.cs
Source:
TypeConverter.cs
Source:
TypeConverter.cs

Converts the given object to the type of this converter, using the specified context and culture information.

public:
 virtual System::Object ^ ConvertFrom(System::ComponentModel::ITypeDescriptorContext ^ context, System::Globalization::CultureInfo ^ culture, System::Object ^ value);
public virtual object ConvertFrom (System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value);
public virtual object? ConvertFrom (System.ComponentModel.ITypeDescriptorContext? context, System.Globalization.CultureInfo? culture, object value);
abstract member ConvertFrom : System.ComponentModel.ITypeDescriptorContext * System.Globalization.CultureInfo * obj -> obj
override this.ConvertFrom : System.ComponentModel.ITypeDescriptorContext * System.Globalization.CultureInfo * obj -> obj
Public Overridable Function ConvertFrom (context As ITypeDescriptorContext, culture As CultureInfo, value As Object) As Object

Parameters

context
ITypeDescriptorContext

An ITypeDescriptorContext that provides a format context.

culture
CultureInfo

The CultureInfo to use as the current culture.

value
Object

The Object to convert.

Returns

Object

An Object that represents the converted value.

Exceptions

NotSupportedException

The conversion cannot be performed.

Remarks

Custom type authors that intend to support a type conversion behavior for XAML typically implement a TypeConverter class that supports ConvertFrom behavior from a string. This behavior enables type conversion from the string provided as a XAML attribute value and provides a XAML processor with the support needed to create an object from the string, so that the object can be produced in a parsed object graph. Custom types or members of custom types are indicated by applying TypeConverterAttribute to the definitions, with the attribute referencing the custom TypeConverter implementation.

For XAML purposes, you do not typically provide branching implementations based on culture. This is because XAML is precompiled in a development environment context, and culture-specific information for runtime XAML is not relevant for XAML type conversion. For more information, see Type Converters for XAML Overview.

Notes to Inheritors

Override this method to provide your own conversion requirements.

Use the context parameter to extract additional information about the environment from which this converter is invoked. This parameter can be null, so always check it. Also, properties on the context object can return null.

For implementation patterns for type converters that are used to support XAML and custom types, see Type Converters for XAML Overview.

See also

Applies to