String builder问题.... [英] String builder problems....

问题描述

大家好，



我正在尝试使用StringBuilder以奇数格式构造字符串，即

00 00 00 00能够对字符串构建者更精通的人能告诉我我做错了什么。我的代码在

Hi All,

I am trying to use a StringBuilder to construct a string in an odd format ie
"00 00 00 00 " can someone who is a bit more versed with the string builder tell me what I am doing wrong. the code I have is below

string Credit_Value_String = "00000000";

         StringBuilder ValueUPDwn = new StringBuilder();


         MessageBox.Show("Value is: " + numericUpDown1.Value.ToString());

         //if (IsNumeric(numericUpDown1.Value))
        // {

            for (int i = 0; i <= Credit_Value_String.Length; i+=2)
             {
                  ValueUPDwn.Append(Credit_Value_String.Substring(i,2));
                  if (i < Credit_Value_String.Length - 2)
                  {
                      ValueUPDwn.Append(" ");
                  }

             }

             Credit_Value_String = ValueUPDwn.ToString();
             MessageBox.Show(Credit_Value_String);
        // }

将鼠标悬停在ValueUPDwn上debug正确显示其中的字符串空间00 00 00 00这是想要的（我将在以后使用数值向下工具取值）但是这不会运行长度达到最大值（8 ）它试图超越边缘而迷失方向。我不明白的是我之前使用过这种方法没有任何问题......正如我所说的那样，我过去没有使用过StringBuilders，因为我在这里尝试的代码以前在项目中已经工作过了我会后悔的当gremlin稍后爬出来的时候。

Glenn

Hovering over ValueUPDwn in debug shows the string in it space correctly "00 00 00 00" which is what is wanted (I''m going to take the value off a numeric up down tool later) however this does not run the length gets up to max (8) and it tries to go over the edge and gets lost. What I donot understand is I have used this method earlier with no problems...as I said I have not used StringBuilders very much in the past, as the code I am trying here has worked before in the project am I going to regret it when a gremlin crawls out later.
Glenn

推荐答案

我认为你的问题是你在结束时抓住了1个字符。字符串。在下面的函数中，for循环有 Credit_Value_String.length -1 。



如果你的字符串不是偶数个字符，你也会超出字符串长度所以添加：（Credit_Value_String.Length< i + 2）？

I think your problem was the fact that you are grabbing 1 char past the end of the string. In the function below the for loop has Credit_Value_String.length -1.

If your string is not an even number of chars you will also overrun the string length so added: (Credit_Value_String.Length < i+2) ?

static string AnotherCrazyParsingMethod(string Credit_Value_String)
{
   StringBuilder ValueUPDwn = new StringBuilder();

   for (int i = 0; i < Credit_Value_String.Length; i += 2)
   {
       ValueUPDwn.AppendFormat("{0}{1} ", Credit_Value_String[i],           (Credit_Value_String.Length < i+2) ? '\0' : Credit_Value_String[i + 1]);
   }
   return ValueUPDwn.ToString();
}

你跑掉了字符串的结尾：

You ran off the end of the string:

for (int i = 0; i <= Credit_Value_String.Length; i+=2)

应该是：

Should be:

for (int i = 0; i < Credit_Value_String.Length; i+=2)

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