InvalidArgument =值'1'对'index'无效。 [英] InvalidArgument=Value of '1' is not valid for 'index'.

问题描述

<pre lang="vb"><pre lang="vb">Dim ans As Double 
For z As Integer = 0 To ListBox1.Items.Count
            ans = Math.Sqrt((ListBox1.Items(z) - ListBox3.Items(z)) ^ 2 + Convert.ToInt32(ListBox2.Items(z) - ListBox4.Items(z)) ^ 2)

            ListBox5.Items.Add(ans)&lt;/pre&gt;</pre>

i尝试一下，但是这样的错误。

InvalidArgument ='1'的值对'index'无效。

任何人都可以帮帮我？

i try it, but error like this.
InvalidArgument=Value of '1' is not valid for 'index'.
anyone could help me?

推荐答案

使用这个;）

use This ;)

For z As Integer = 0 To ListBox1.Items.Count -1

项目为零基于..



计数返回1 ..意味着只有项目索引0

但你再循环通过它wi th index 1 ..这是你得到错误的地方

因为没有项目（1）！



greets

Items is zero based ..

count returns 1 .. means there is only the item index 0
but you loop again through it with index 1 ..this is where you get your error
because there is no item(1)!

greets

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