TimeSpanMinutesConverter 类

定义

public ref class TimeSpanMinutesConverter : System::Configuration::ConfigurationConverterBase

public class TimeSpanMinutesConverter : System.Configuration.ConfigurationConverterBase

type TimeSpanMinutesConverter = class
    inherit ConfigurationConverterBase

Public Class TimeSpanMinutesConverter
Inherits ConfigurationConverterBase

继承

Object

TypeConverter

ConfigurationConverterBase

TimeSpanMinutesConverter

派生

System.Configuration.TimeSpanMinutesOrInfiniteConverter

示例

下面的代码示例演示如何定义自定义 TimeSpanMinutesConverter 类型。The following code example shows how to define a custom TimeSpanMinutesConverter type.

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Globalization;
using System.ComponentModel;

public sealed class CustomTimeSpanMinutesConverter :
    ConfigurationConverterBase
{
    internal bool ValidateType(object value, 
        Type expected)
    {
        bool result;

        if ((value != null) &&
            (value.GetType() != expected))
            result = false;
        else
            result = true;

        return result;
    }

    public override bool CanConvertTo(
        ITypeDescriptorContext ctx, Type type)
    {
        return (type == typeof(string));
    }

    public override bool CanConvertFrom(
        ITypeDescriptorContext ctx, Type type)
    {
        return (type == typeof(string));
    }

    public override object ConvertTo(
        ITypeDescriptorContext ctx, CultureInfo ci,
        object value, Type type)
    {
        ValidateType(value, typeof(TimeSpan));

        long data = (long)(((TimeSpan)value).TotalMinutes);

        return data.ToString(CultureInfo.InvariantCulture);
    }

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

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

        return TimeSpan.FromMinutes((double)min);
    }
}

Imports System.Collections.Generic
Imports System.Text
Imports System.Configuration
Imports System.Globalization
Imports System.ComponentModel




NotInheritable Public Class CustomTimeSpanMinutesConverter
    Inherits ConfigurationConverterBase
    
    Friend Function ValidateType(ByVal value As Object, _
    ByVal expected As Type) As Boolean
        Dim result As Boolean

        If Not (value Is Nothing) _
        AndAlso value.ToString() <> expected.ToString() Then
            result = False
        Else
            result = True
        End If
        Return result

    End Function 'ValidateType
    
    
    Public Overrides Function CanConvertTo( _
    ByVal ctx As ITypeDescriptorContext, _
    ByVal type As Type) As Boolean
        Return (type.ToString() = GetType(String).ToString())

    End Function 'CanConvertTo
    
    Public Overrides Function CanConvertFrom( _
    ByVal ctx As ITypeDescriptorContext, _
    ByVal type As Type) As Boolean
        Return (type.ToString() = GetType(String).ToString())

    End Function 'CanConvertFrom
    
    Public Overrides Function ConvertTo( _
    ByVal ctx As ITypeDescriptorContext, _
    ByVal ci As CultureInfo, ByVal value As Object, _
    ByVal type As Type) As Object
        ValidateType(value, GetType(TimeSpan))

        Dim data As Long = _
        Fix(CType(value, TimeSpan).TotalMinutes)

        Return data.ToString(CultureInfo.InvariantCulture)

    End Function 'ConvertTo
    
    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

End Class

下面是前面的示例使用的配置摘录。The following is a configuration excerpt used by the previous example.

<configuration>  

  <configSections>  
    <section name="CustomSection"  
      type="Samples.AspNet.CustomSection,  
      ConfigurationConverters,  
      Version=1.0.0.0, Culture=neutral,  
      PublicKeyToken=null"  
      allowDefinition="Everywhere"  
      allowExeDefinition="MachineToApplication"  
      restartOnExternalChanges="true" />  
  </configSections>  

  <CustomSection fileName="default.txt" maxIdleTime="90"   
    timeDelay="infinite" cdStr="str0, str1" permission="Read"   
    maxUsers="Infinite"/>  

</configuration>  

注解

与所有其他配置转换器类型一样，此类型将在配置文件中找到的字符串转换为相关的强类型属性。This type, like all the other configuration converter types, converts strings found in the configuration file to and from the related strongly typed properties.

具体而言， TimeSpanMinutesConverter 将 String 分配给配置属性的分钟数转换为 TimeSpan 分钟，反之亦然。In particular, the TimeSpanMinutesConverter converts String minutes, assigned to a configuration property, to TimeSpan minutes and vice versa.

TimeSpanMinutesConverter保留表示分钟数的类型的值 long 。The TimeSpanMinutesConverter persists values of type long representing a number of minutes.

构造函数

方法

适用于

另请参阅

• GenericEnumConverter
• InfiniteIntConverter
• InfiniteTimeSpanConverter
• TimeSpanMinutesOrInfiniteConverter
• TimeSpanSecondsConverter
• TimeSpanSecondsOrInfiniteConverter
• TypeNameConverter
• WhiteSpaceTrimStringConverter