ListView查找项目并填充texbox [英] ListView find item and populate texbox

问题描述

大家好，我有一个ListView，其中包含客户姓名，地址和电子邮件地址。我需要找到电子邮件地址，然后填充一个文本框。



以下代码但没有工作错误消息;



mscorlib.dll中出现'System.ArgumentOutOfRangeException'类型的异常，但未在用户代码中处理

附加信息：索引超出范围。必须是非负数且小于集合的大小



我的代码到目前为止...

Hi folks, I have a ListView that contains customer name, address and email address. I need to find the email address and then populate a textbox.

Code below but not working error message;

An exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll but was not handled in user code
Additional information: Index was out of range. Must be non-negative and less than the size of the collection

My code so far...

int idx = ListView1.SelectedIndex;
TextBox GarageEmail.Text = (TextBox)this.ListView1.Items[idx].FindControl("SupplierEmailAddress");

推荐答案

SelectedIndex是零 - ListView控件中所选项的基于索引。默认值为-1，表示当前没有选择任何项。 （来自 MSDN [ ^ ]）...所以你应该检查它是否不是-1，以确保任何项目被选中......

SelectedIndex is "The zero-based index of the selected item in a ListView control. The default is -1, which indicates that no item is currently selected." (from MSDN[^])...So you should check if it is NOT -1 to be sure that any item has been selected...

if(ListView1.SelectedIndex != -1)
{
  int idx = ListView1.SelectedIndex;
  TextBox GarageEmail.Text = (TextBox)this.ListView1.Items[idx].FindControl("SupplierEmailAddress");
}

现在换第二行......这是完全错误的？左侧部分，如果TextBox的文本属性（不清楚它来自哪里），右侧是TextBox控件...你可能想做这样的事情：

Now for the second line...It is completely wrong? The left side part if the text property of a TextBox (not clear from where it comes), where the right side is a TextBox control...You probably meant to do something like this:

TextBox GarageEmail = (TextBox)this.ListView1.Items[idx].FindControl("SupplierEmailAddress");

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