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如何将vb.net中的扩展移植到c_?

stringbuilder extension-methods vb.net c#

Anders · 技术社区 · 16 年前

我在vb.net中编写了一个扩展,用于StringBuilder添加 AppendFormattedLine 方法(这样我就不必使用换行符的参数之一):

Imports System.Runtime.CompilerServices
Public Module sbExtension
    <Extension()> _
    Public Sub AppendFormattedLine(ByVal oStr As System.Text.StringBuilder, _
                                   ByVal format As String, _
                                   ByVal arg0 As Object)
        oStr.AppendFormat(format, arg0).Append(ControlChars.NewLine)
    End Sub
    <Extension()> _
    Public Sub AppendFormattedLine(ByVal oStr As System.Text.StringBuilder, _
                                   ByVal format As String, ByVal arg0 As Object, _
                                   ByVal arg1 As Object)
        oStr.AppendFormat(format, arg0, arg1).Append(ControlChars.NewLine)
    End Sub
    <Extension()> _
    Public Sub AppendFormattedLine(ByVal oStr As System.Text.StringBuilder, _
                                   ByVal format As String, _
                                   ByVal arg0 As Object, _
                                   ByVal arg1 As Object, _
                                   ByVal arg2 As Object)
        oStr.AppendFormat(format, arg0, arg1, arg2).Append(ControlChars.NewLine)
    End Sub
    <Extension()> _
   Public Sub AppendFormattedLine(ByVal oStr As System.Text.StringBuilder, _
                                  ByVal format As String, _
                                  ByVal ParamArray args() As Object)
        oStr.AppendFormat(format, args).Append(ControlChars.NewLine)
    End Sub
End Module

3 回复 | 直到 16 年前

Joel Coehoorn 16 年前

我不会筑巢 string.Format() 这样的电话。

你知道吗? string.format()。 在后台创建一个新的StringBuilder并调用它 AppendFormat() 方法?以上面的第一种方法为例,这应该更有效:

sb.AppendFormat(format, arg0).Append(Environment.NewLine);

你也应该对你的VB代码做同样的修改。

Anders 16 年前

以下是我提出的移植代码:

using System;
using System.Text;

public static class ExtensionLibrary
{
    public static void AppendFormattedLine(this StringBuilder sb, string format, object arg0)
    {
        sb.AppendFormat(format, arg0).Append(Environment.NewLine);
    }
    public static void AppendFormattedLine(this StringBuilder sb, string format, object arg0, object arg1)
    {
        sb.AppendFormat(format, arg0, arg1).Append(Environment.NewLine);
    }
    public static void AppendFormattedLine(this StringBuilder sb, string format, object arg0, object arg1, object arg2)
    {
        sb.AppendFormat(format, arg0, arg1, arg2).Append(Environment.NewLine);
    }
    public static void AppendFormattedLine(this StringBuilder sb, string format, params object[] args)
    {
        sb.AppendFormat(format, args).Append(Environment.NewLine);
    }
}

希望这对某人有用!

改进了代码,感谢Joel、Luke和Jason。

Chris 16 年前

我以前从未使用过Telerik的代码转换器,但它认为:

public class sbExtension
{
    [Extension()]
    public void AppendFormattedLine(System.Text.StringBuilder oStr, string format, object arg0)
    {
        oStr.AppendFormat(format, arg0).Append(ControlChars.NewLine);
    }
    [Extension()]
    public void AppendFormattedLine(System.Text.StringBuilder oStr, string format, object arg0, object arg1)
    {
        oStr.AppendFormat(format, arg0, arg1).Append(ControlChars.NewLine);
    }
    [Extension()]
    public void AppendFormattedLine(System.Text.StringBuilder oStr, string format, object arg0, object arg1, object arg2)
    {
        oStr.AppendFormat(format, arg0, arg1, arg2).Append(ControlChars.NewLine);
    }
    [Extension()]
    public void AppendFormattedLine(System.Text.StringBuilder oStr, string format, params object[] args)
    {
        oStr.AppendFormat(format, args).Append(ControlChars.NewLine);
    }
}


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