如何停止反复添加Combobox [英] How Can I Stop Repeatedly Adding In Combobox

问题描述

Dim MyTableCount As Integer = ds.Tables.Count
        For Each row As DataRow In ds.Tables(0).Rows
            cmbToDatabase.Properties.Items.Add(row.Item("Name"))
        Next row

它填充组合框三次。如何只填充一次

it fills the combobox thrice.How i fill only one time

推荐答案

在组合框中添加项目之前，请在下面的代码中写下此代码，它将清除所有组合框属性项目

Write this below code before you add the items in combobox, it'll clear all the combobox property items

cmbToDatabase.Properties.Items.Clear()
Dim MyTableCount As Integer = ds.Tables.Count
        For Each row As DataRow In ds.Tables(0).Rows
            cmbToDatabase.Properties.Items.Add(row.Item("Name"))
        Next row

这些问题很容易解决。在调试器下执行。将断点放在添加项目的代码行中，并在第二次发生时捕获它们。在调试器中，查看调用堆栈窗口。它会显示所有电话到达此行的位置。

-SA

Such problems are easy to solve. Do it under the debugger. Put a breakpoint the the line of code where the items are added and catch them moment when it happens for the second time. In the debugger, look at "Call stack" window. It will show you where all the calls get you to this line.

—SA

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