对于Int32，值太大或太小。 [英] Value was either too large or too small for an Int32.

问题描述

我有一个表单，可以在文本框文本更改时添加和减去数字。如果我输入2181003000 - 899763000之类的数字，我会收到此错误，对于Int32，值太大或太小。。我该如何解决这个问题？

  protected   void  TextBoxNPRNA_TextChanged（ object  sender，EventArgs e）
 {
  int  a = Convert.ToInt32（TextBoxTUNA.Text）; 
  int  b = Convert.ToInt32（TextBoxETRNA.Text）; 
  int  c = Convert.ToInt32（TextBoxNPRNA.Text）; 
 TextBoxTNA2.Text = Convert.ToString（a + b + c）; 
 TextBoxTR.Focus（）; 
} 
 

解决方案

为什么人们坚持这样做？



永远不要使用Convert来改变用户输入的类型：改用tryParse。这样当用户犯错 - 就像他们一直做的那样 - 你可以在它成为问题之前检测到它，然后告诉他们他们要做些什么来解决它：

  int  a; 
  if （！int.TryParse（TextBoxTUNA.Text， out  a））
 {
  //  向用户报告问题 
 返回; 
} 

int 可以存储介于-2 ^ 32-1到2之间的值^ 32。要存储更大的内容，请使用 long 数据类型，该数据类型可以存储在-2 ^ 64-1到2 ^ 64之间。

  int  a = Convert.ToInt32（TextBoxTUNA.Text）; 

上面的问题代码与TextBoxTUNA.Text值2181003000是

你不能存小的大号。

-2,147,483,648 .. 2,147,483,647是int数据类型的范围;所以你怎么能把2181003000存放在int !!



就像试着把1.5升放入1升罐中一样。

你可以做点什么喜欢

  Int32  a = Convert.ToInt32（TextBoxTUNA.Text）; 

I have a form that adds and subtracts numbers on textbox text change. If I put in a number like 2181003000 - 899763000 I get this error, "Value was either too large or too small for an Int32.". How can I fix this?

protected void TextBoxNPRNA_TextChanged(object sender, EventArgs e)
   {
       int a = Convert.ToInt32(TextBoxTUNA.Text);
       int b = Convert.ToInt32(TextBoxETRNA.Text);
       int c = Convert.ToInt32(TextBoxNPRNA.Text);
       TextBoxTNA2.Text = Convert.ToString(a + b + c);
       TextBoxTR.Focus();
   }

解决方案

Why do people insist on doing this?

Never use Convert to change the type of user input: use TryParse instead. That way when the user makes a mistake - as they do all the time - you can detect it before it becomes a problem, and tell them exactly what they have to do to fix it:

int a;
if (!int.TryParse(TextBoxTUNA.Text, out a))
   {
   // Report problem to user
   return;
   }

An int can store values between -2^32-1 to 2^32. To store anything larger, use long data type which can store between -2^64-1 to 2^64.

int a = Convert.ToInt32(TextBoxTUNA.Text);

Problem in above code with TextBoxTUNA.Text value 2181003000 is
You can not store big no in small.
-2,147,483,648 .. 2,147,483,647 is the range of int datatype; so how can you store 2181003000 in int!!

Its like try to put 1.5 liter into 1 liter can.
You can do something like

Int32 a = Convert.ToInt32(TextBoxTUNA.Text);

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