如何将自定义选项添加到绑定的组合框中 [英] how to add custom option to a binded combobox

问题描述

 受保护  void  BindCat（）
 {
 ddlCategory.DataSource = objProdCat.SelectAll（）; 
 ddlCategory.DisplayMember =   ProductCatName; 
 ddlCategory.ValueMember =   ProductCatId; 
 ddlCategory.Items.Insert（ 0 ， 添加新类别）; 
  //   MessageBox.Show（ddlCategory.SelectedValue.ToString（））;  
} 

我想为已绑定的combobx添加自定义选项，但这不起作用。它现在显示我的值1,2,3,4,5



如何将自定义字段添加到已绑定的组合框中？

解决方案

您可以将默认文本添加到组合框的Text属性中，如下所示（首选）：

 ddlCategory.Text =添加新类别; 

或者，您可以直接将值添加到数据表：



如果您使用数据表

 da.Fill（dt）; 
 DataRow row = dt.NewRow（）; 
 row [Category] =添加新类别; 
 dt.Rows.InsertAt（row，0）; 
 ddlCategory.DataSource = dt; 
} 

如果您使用的是班级列表

 objProdCat = getinglist 
 objProdCat.Insert（0，Add new Category）; 
 ddlCategory.DataSource = objProdCat.SelectAll（）; 

protected void BindCat()
{
        ddlCategory.DataSource=objProdCat.SelectAll();
        ddlCategory.DisplayMember = "ProductCatName";
        ddlCategory.ValueMember = "ProductCatId";
        ddlCategory.Items.Insert(0, "Add new Category"); 
        //MessageBox.Show(ddlCategory.SelectedValue.ToString()); 
}

I want to add a custom option to a already bound combobx but this is not working. It is now showing me values 1,2,3,4,5

How to add a custom field to a already bound combobox?

解决方案

You could either add the default text to the Text property of the combobox like this (preferred):

ddlCategory.Text = "Add new Category";

Or, you could add the value to the datatable directly:

if you are using datatable

da.Fill(dt);
DataRow row = dt.NewRow();
row["Category"] = "Add new Category";
dt.Rows.InsertAt(row, 0);
ddlCategory.DataSource = dt;
}

if you are using list of class

objProdCat=getinglist
objProdCat.Insert(0,"Add new Category");
ddlCategory.DataSource=objProdCat.SelectAll(); 

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