运算符'+'不能应用于'string []'和'int'类型的操作数 [英] Operator '+' cannot be applied to operands of type 'string[]' and 'int'

问题描述

  protected   void  ddlCircle_SelectedIndexChanged（对象发​​件人，EventArgs e）
 {
 ArrayList list =  new  ArrayList（）; 
 
 ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter cd; 
 cd =  new  ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter（）; 
 DataTable dt =  new  DataTable（）; 
 dt = cd.GetAvailableData（ddlCircle.SelectedValue）; 
 
  int  x; 
 x = dt.Rows.Count; 
 
  String  [] a; 
 字符串 [] b = { 团队}; 
  for （ int  i =  1 ; i <  = x; i ++）
 {
a = b + i;  //  此处出现错误 
} 
} 
 

解决方案

尝试：

这是一些非常奇怪的代码：它不是很明显你期望从中得到什么 - 但是到目前为止还有更多的错误！

首先， a 是一个字符串数组 - 除了你没有' t分配任何空间来保存数据。

其次，为什么 b 和字符串数组（如果你只在那里放一个元素），每次使用相同的元素？为什么不只是一个字符串？

第三，你期望什么代码

 a = b + i; 
 

实际上要做什么？特别是在循环中？

由于你没有在循环中改变b，整个循环可以用 x 替换为单个语句无论如何， a 总是会包含相同的值。

a是一个数组（没有数据），b是一个数组（带有一个元素），我是一个整数 - 所以我看不出任何特别有用的东西进入 a 无论如何。



想想你想要实现的目标，而不是你到目前为止所写的内容：因为我认为你已经忘记了这一点 - 我怀疑你打算使用 dt 在那里使用你在早期代码中检索的数据！

这里的意图似乎生成了名为Teamx的x队列。请更改您的命名以更好地反映变量的意图。



执行此操作：

 ArrayList teamList =  new  ArrayList; 
 
  for （ int  i =  1 ; i <  = x; i ++）
 {
 teamList.Add（ String  .Format（ 团队{0}，i））; 
} 

如果你真的需要字符串数组然后使用

 字符串 []团队; 
 teams = teamList.ToArray（ typeof （ string ））; 

protected void ddlCircle_SelectedIndexChanged(object sender, EventArgs e)
   {
     ArrayList list = new ArrayList();

     ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter cd;
     cd = new ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter();
     DataTable dt = new DataTable();
     dt = cd.GetAvailableData(ddlCircle.SelectedValue);

     int x;
     x = dt.Rows.Count;

       String [] a;
       String [] b = { "Team" };
       for (int i = 1; i <= x; i++)
       {
           a = b + i; // error popup here
       }
  }

解决方案

Try:
That is some very odd code: it's not obvious exactly what you expect to get out of it - but there are more errors in there than you have seen so far!
First off, a is an array of strings - except you haven't allocated any space to hold the data.
Second, why is b and array of strings if you are only putting one element in there, and use the same element each time? Why not just a string?
Third, what do you expect the code

a = b + i;

To actually do? Particularly in a loop?
Since you don't change b inside the loop, the whole loop can be replaced with a single statement using x since a would always contain the same value after it finishes anyway.
And a is an array (with no data), b is an array (with one element) and i is an integer - so I can't see anything particularly useful going into a anyway.

Think about what you are trying to achieve, rather than what you have written so far: because I think you have lost track of that - I suspect you meant to use dt in there somewhere to use the data you retrieved in the earlier code!

The intent here seems to generate the array of x teams with names Teamx. Please change your naming to better reflect the intent of the variable.

Do this:

ArrayList teamList = new ArrayList;

for (int i = 1; i <= x; i++)
        {
            teamList.Add(String.Format("Team{0}", i)); 
        }

And if you really need string array then use

String [] teams;
teams = teamList.ToArray(typeof( string ));

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