索引超出范围异常 [英] index out of range exception

问题描述

Hello All，



我有一个片段：

主题[] t =  new 线程[ 3 ]; 
  string  [] items =  new   string  [] {  hi，  hello，  hey}; 
 
 
  for （ int  i =  0 ; i <  = t.Length; i ++） ///  当我将鼠标悬停在此处时，我= 3 
  {
  string  s = items [i];  ///  索引超出范围异常抛出
  
t [i] =  new 线程（（）=> work（s））; 
 t [i] .IsBackground =  true ; 
 uplist< string> up =  new  uplist< string>（t [i]）; 
 up.Add_item（items [i]）; 
 
} 

这是否意味着当我说：



for（; i< = value;）///这里我被分配了值，所以在下一次迭代中我已达到最大值，因此它会爆发并抛出异常？



循环开始的那一刻抛出一个异常，因为当i = 3时应该抛出异常。



有人可以详细说明这个吗？

解决方案

使用来自<$的索引迭代 items 数组c $ c> t 数组。



如果他们都有相同数量的物品，那就有效，但这只是偶然。

更好地构造 t 使用项目的长度。



正确的代码是：

  string  [] items =  new   string  [] {  hi，  hello，  hey}; 
 Thread [] t =  new  Thread [items.length]; 
  for （ int  i =  0 ; i <  t.Length; i ++）
 {
  string  s = items [i]; 
 t [i] =  new 主题（（）= >  work（s））; 
 t [i] .IsBackground =  true ; 
 uplist< string> up =  new  uplist< string>（t [i]）; 
 up.Add_item（items [i]）; 
} 

替换你的for循环

 for （ int  i =  0  ; i <  t.Length; i ++） ///  当我将鼠标悬停在此处时，i = 3 
  {
  string  s = items [i];  ///  索引超出范围异常抛出
 } 
 

**因为尽管数组中有3个元素..但默认情况下数组从0位开始索引。因此，如果您尝试在第3个位置找到元素，则会出错。

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

将其替换为

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

如果它是< = 它将检查3然后它将尝试访问数组的第四个索引，因此你得到索引异常..

Hello All,

I have a snippet :

Thread[] t = new Thread[3];
          string[] items = new string[] {"hi","hello","hey"};


          for(int i = 0 ; i <=t.Length; i++) /// When i hover my mouse here then i = 3
          {
              string s = items[i];/// index out of range exception thrown here

              t[i] = new Thread(()=>work(s));
              t[i].IsBackground = true;
              uplist<string> up = new uplist<string>(t[i]);
              up.Add_item(items[i]);

          }

Does this mean that when i say :

for( ;i<=value;) ///here i is assigned the "value" and so in the next iteration i has reached the maximum value and hence it breaks out and throws an exception ?

The moment the loop starts it throws an exception, where as it should throw an exception when i = 3.

Can someone please elaborate on this?

解决方案

You iterate over the items array using indices from t array.

If they both have the same number of items, that works, but it's only by chance.
Better construct t using length of items.

Correct code would be:

string[] items = new string[] {"hi","hello","hey"};
Thread[] t = new Thread[items.length];
for(int i = 0 ; i < t.Length; i++)
{
   string s = items[i];
   t[i] = new Thread(() => work(s));
   t[i].IsBackground = true;
   uplist<string> up = new uplist<string>(t[i]);
   up.Add_item(items[i]);
}

Replace your for loop by

for (int i = 0; i < t.Length; i++) /// When i hover my mouse here then i = 3
{
           string s = items[i];/// index out of range exception thrown here
}

** Because though there are 3 elements in array.. but by default array starts indexing from 0 position. So if you try to find element at 3 rd position it is giving error.

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

replace it to

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

if it is <= it will check upto 3 then it will try to access the fourth index of the array, so you got the index exception..

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