TimeSpanMinutesConverter Classe

Definição

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

public class TimeSpanMinutesConverter : System.Configuration.ConfigurationConverterBase

type TimeSpanMinutesConverter = class
    inherit ConfigurationConverterBase

Public Class TimeSpanMinutesConverter
Inherits ConfigurationConverterBase

Herança

Object

TypeConverter

ConfigurationConverterBase

TimeSpanMinutesConverter

Derivado

System.Configuration.TimeSpanMinutesOrInfiniteConverter

Exemplos

O exemplo de código seguinte mostra como definir um tipo personalizado TimeSpanMinutesConverter .

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

Segue-se um excerto de configuração usado pelo exemplo anterior.

<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>

Observações

Este tipo, como todos os outros tipos de conversores de configuração, converte cadeias encontradas no ficheiro de configuração para e a partir das propriedades fortemente tipadas relacionadas.

Em particular, converte TimeSpanMinutesConverterString minutos, atribuídos a uma propriedade de configuração, em TimeSpan minutos e vice-versa.

Os TimeSpanMinutesConverter valores persistentes de tipo long representando um número de minutos.

Ver também

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