帮我从Combobox获取文本。 [英] Help me to get text from Combobox.

问题描述

嗨朋友，



如果我使用以下代码，那么我会收到错误（附加信息：InvalidArgument ='2'的值对'index'无效。 ）

  Dim  index1  As  整数 =  0  
  Dim 电子邮件< span class =code-keyword> As   String  = ComboBox1.Items.Item（index1）.ToString 
 index1 = index1 +  1  

但如果我手动输入索引像0或其他东西那么它的工作原理。如下代码作品

  Dim  email  As   String  = ComboBox1.Items.Item（ 0 ）。ToString 

请告诉我这是什么问题？

解决方案

string s =（（yourItemType）yourComboBox.SelectedItem）.yourWishProperty;在C＃



在这种情况下



Dim email As String =（（string）ComboBox1.SelectedItem） .text

使用此

  Dim  index1  As  整数 =  0  

在你的函数之外并公开你的变量然后使用它

如果你使用一个计时器，那么<​​code> index1 可能高于 Items 的最高索引。在您尝试从组合框中获取项目之前，请检查是否可能：

 如果 ComboBox1.Items.Count> index1 然后 
  Dim 电子邮件 As  字符串 = ComboBox1.Items.Item（index1）.ToString 
 index1 = index1 +  1  
 否则 
 '  index1 is高于组合框项目的最高索引 
 结束 如果 

Hi Friend,

If I use following code then I get error (Additional information: InvalidArgument=Value of '2' is not valid for 'index'.)

Dim index1 As Integer = 0
Dim email As String = ComboBox1.Items.Item(index1).ToString
index1 = index1 + 1

But If I manually put index like 0 or something else then it works. Like following code works

Dim email As String = ComboBox1.Items.Item(0).ToString

Please tell me what's the problem is?

解决方案

string s = ((yourItemType)yourComboBox.SelectedItem).yourWishProperty; in C#

In this case

Dim email As String = ((string)ComboBox1.SelectedItem).text

Use this

Dim index1 As Integer = 0 

outside of your function and make your variable public and then use it

If you use a timer, then index1 becomes probably higher than the highest index of Items. Before you try to get the item from the combobox, check whether it is possible:

If ComboBox1.Items.Count > index1 Then
    Dim email As String = ComboBox1.Items.Item(index1).ToString
    index1 = index1 + 1
Else
    ' index1 is higher than the highest index of the combobox items
End If

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