创建一个派生自字符串构建器的类，以附加任意数量的字符串 [英] Create a class that derives from string builder to append any number of strings

问题描述

我想创建一个派生自字符串构建器的类，以附加任意数量的字符串。

我的程序应允许用户输入自己的字符串数量

示例用法：

i want to create a class that derives from string builder to append any number of strings.
My Program shoul allow the user input their own number of strings
example usage:

//Format Post Data

                StringBuilder postData = new StringBuilder();
                postData.Append("dst");
                postData.Append("&popup=true");
                postData.Append(String.Format("&username={0}", USERNAME_Validate1));// reads username from username textbox
                postData.Append(String.Format("&password={0}", PASSWORD_Validate1));// reads password from password textbox

                //Write Post Data To Server

                using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
                    writer.Write(postData);

我尝试了什么：



i能够在代码中附加带字符串构建器的字符串，但我希望用户能够指定自己的字符串。

What I have tried:

i am able to append string with string builder inside the code but i want the user to be able to specify their own.

推荐答案

你不能。

你不能从StringBuilder派生，它是一个密封的类： MSDN StringBuilder [ ^ ]

你必须封装它：创建一个包含内部私有StringBuilder的新类，并公开所有必要的方法你自己。

You can't.
You cannot derive from StringBuilder, it is a sealed class: MSDN StringBuilder[^]
You will have to encapsulate it: create a new class which contains an internal private StringBuilder, and expose all the necessary methods yourself.

除了完全有效的解决方案1之外，你还可以在StringBuilder类上创建扩展方法。

类似于：

In addition to the perfectly valid Solution 1, you also have the ability to create extension methods on the StringBuilder class.
Something like:

public static class Utility
{
   public static StringBuilder AppendAnyNumberOfStrings(this StringBuilder sb, params string elements) {
      foreach (string element in elements) {
         sb.Append(element);
      }
      return sb;
   }
}

并且StringBuilder类已经有一个 AppendFormat 方法删除了需要在附加中使用 String.Format 方法。

StringBuilder.AppendFormat方法 [ ^ ]



希望这会有所帮助。

And the StringBuilder class already has an AppendFormat method which removes the need to use the String.Format method inside the Append one.
StringBuilder.AppendFormat method[^]

Hope this helps.

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