C＃ - 填充组合框与一个DataTable [英] C# - Fill a combo box with a DataTable

问题描述

我已经习惯了与Java工作的地方都可以大量的例子。由于种种原因，我不得不切换到C＃和尝试做以下的SharpDevelop的：

I'm used to work with Java where large amounts of examples are available. For various reasons I had to switch to C# and trying to do the following in SharpDevelop:

// Form has a menu containing a combobox added via SharpDevelop's GUI

// --- Variables
languages = new string[2];
languages[0] = "English";
languages[1] = "German";
DataSet myDataSet = new DataSet();

// --- Preparation
DataTable lTable = new DataTable("Lang");
DataColumn lName = new DataColumn("Language", typeof(string));
lTable.Columns.Add( lName );
for( int i=0; i<languages.Length; i++ ) {
    DataRow lLang = lTable.NewRow();
    lLang["Language"] = languages[i];
    lTable.Rows.Add(lLang);
}
myDataSet.Tables.Add(lTable);

// --- Handling the combobox
mnuActionLanguage.ComboBox.DataSource = myDataSet.Tables["Lang"].DefaultView;
mnuActionLanguage.ComboBox.DisplayMember = "Language";

人们认为看到在下拉列表中的一些值，但它是空的。请告诉我，我在做什么错误;（

One would assume to see some values in the dropdown, but it's empty. Please tell me what I'm doing wrong ;(

编辑： mnuActionLanguage.ComboBox.DataBind（）是我还发现，在网上，但它不能在我的情况下工作。的

mnuActionLanguage.ComboBox.DataBind() is what I also found on the net, but it doesn't work in my case.

解决方案：

mnuActionLanguage.ComboBox.BindingContext = this.BindingContext;

在最后的问题解决了！

at the end solved the problem!

推荐答案

您需要设置ToolStripComboBox.ComboBox的绑定上下文。

You need to set the binding context of the ToolStripComboBox.ComboBox.

下面是我刚才使用Visual Studio重新创建code稍微修改后的版本。菜单项组合框被称为toolStripComboBox1在我的情况。注code中的最后一行，设置绑定上下文。

Here is a slightly modified version of the code that I have just recreated using Visual Studio. The menu item combo box is called toolStripComboBox1 in my case. Note the last line of code to set the binding context.

我注意到，如果组合是在可见光是工具条的，如果没有这种结合工作，但不是当它是在一个下拉。你得到了同样的问题？

I noticed that if the combo is in the visible are of the toolstrip, the binding works without this but not when it is in a drop-down. Do you get the same problem?

如果你不能得到这个工作，通过我的联系页面给我写信，我会送你的项目。您将无法使用SharpDevelop的加载，但会用C＃防爆preSS。

If you can't get this working, drop me a line via my contact page and I will send you the project. You won't be able to load it using SharpDevelop but will with C# Express.

var languages = new string[2];
languages[0] = "English";
languages[1] = "German";

DataSet myDataSet = new DataSet();

// --- Preparation
DataTable lTable = new DataTable("Lang");
DataColumn lName = new DataColumn("Language", typeof(string));
lTable.Columns.Add(lName);

for (int i = 0; i < languages.Length; i++)
{
    DataRow lLang = lTable.NewRow();
    lLang["Language"] = languages[i];
    lTable.Rows.Add(lLang);
}
myDataSet.Tables.Add(lTable);

toolStripComboBox1.ComboBox.DataSource = myDataSet.Tables["Lang"].DefaultView;
toolStripComboBox1.ComboBox.DisplayMember = "Language";

toolStripComboBox1.ComboBox.BindingContext = this.BindingContext;

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