TimeSpanMinutesConverter.ConvertFrom(ITypeDescriptorContext, CultureInfo, Object) 方法

定义

String 转换为 TimeSpanConverts a String to a TimeSpan.

public:
 override System::Object ^ ConvertFrom(System::ComponentModel::ITypeDescriptorContext ^ ctx, System::Globalization::CultureInfo ^ ci, System::Object ^ data);
public override object ConvertFrom (System.ComponentModel.ITypeDescriptorContext ctx, System.Globalization.CultureInfo ci, object data);
override this.ConvertFrom : System.ComponentModel.ITypeDescriptorContext * System.Globalization.CultureInfo * obj -> obj
Public Overrides Function ConvertFrom (ctx As ITypeDescriptorContext, ci As CultureInfo, data As Object) As Object

参数

ctx
ITypeDescriptorContext

用于类型转换的 ITypeDescriptorContext 对象。The ITypeDescriptorContext object used for type conversions.

ci
CultureInfo

转换期间使用的 CultureInfo 对象。The CultureInfo object used during conversion.

data
Object

要转换的 String 对象。The String object to convert.

返回

Object

以分钟表示 data 参数的 TimeSpanThe TimeSpan representing the data parameter in minutes.

示例

下面的代码示例演示如何自定义 ConvertFrom 方法。The following code example shows how to customize the ConvertFrom method.

public override object ConvertFrom(
    ITypeDescriptorContext ctx, CultureInfo ci, object data)
{

    long min = long.Parse((string)data,
        CultureInfo.InvariantCulture);

    return TimeSpan.FromMinutes((double)min);
}
Public Overrides Function ConvertFrom( _
ByVal ctx As ITypeDescriptorContext, _
ByVal ci As CultureInfo, ByVal data As Object) As Object

    Dim min As Long = _
    Long.Parse(CStr(data), CultureInfo.InvariantCulture)

    Return TimeSpan.FromMinutes(System.Convert.ToDouble(min))

End Function 'ConvertFrom

注解

ConvertFrom从配置文件读取时,系统使用方法将 String 值转换为 TimeSpanThe system uses the ConvertFrom method when reading from a configuration file to convert a String value to TimeSpan.

适用于