ComboBox.ValueMember和DisplayMember [英] ComboBox.ValueMember and DisplayMember

问题描述

如何设置此值？我有一个DataTable的所有数据我想在组合框中设置，但我不能找到如何设置它。

How do i set this values? I have a DataTable with all the data i want to set in the combobox, but i cant find how to set it.

我试过

ComboBox1.DataSource = dataTable;
ComboBox1.ValueMember = "id"; // --> once hes here, he just jumps out the method
ComboBox1.DisplayMember = "name";

没有编译错误，警告，没有...只是跳出来了！

No compilation error, warning, nothing.. just jumps out!

这是填充DataTable的查询

This is the query to fill the DataTable

"Select * from \"Table\""

我用调试器检查并填充了datatable。列名称为id和name。 ComboBox为空。

I checked with the debugger and the datatable was filled. The columns names are "id" and "name". ComboBox is blank. I'm filling it for the first time!

推荐答案

您不应该设置 datasource

ComboBox1.DataSource = dataTable;

ComboBox1.ValueMember = "id"; 

ComboBox1.DisplayMember = "name";

这是正确的顺序：

ComboBox1.ValueMember = "id"; 

ComboBox1.DisplayMember = "name";

ComboBox1.DataSource = dataTable;

注意：设置 datasource 应该是最后一行。

NOTE: setting datasource should be last line.

如果您先设置 datasource ， SelectedIndexChanged 将会触发，您可能会收到投射错误或其他异常。

If you set datasource first, SelectedIndexChanged event will fire and you may get the cast error or other exception.

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