给DropDownList的DataTextField属性绑定两个字段

最新推荐文章于 2019-08-11 12:51:38 发布

最新推荐文章于 2019-08-11 12:51:38 发布 · 183 阅读

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#数据库 #c#

本文详细介绍了如何通过SQL查询和C#编程实现将多个字段绑定到DropDownList控件中，包括两种不同的实现方式，旨在提高用户体验和数据处理效率。

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给DropDownList的DataTextField属性绑定两个字段

2010年01月03日星期日 20:29

方法1：在SQL查询语句中拼接字段

C#代码

using (SqlConnection conn = new SqlConnection("server=(local);database=Northwind;user id=sa;password=sa;min pool size=4;max pool size=100;Connection Lifetime=30;"))
{
SqlDataAdapter adapter1 = new SqlDataAdapter("Select Top 10 ProductId,ProductName+','+convert(nvarchar,UnitPrice) Text FROM Products", conn);
DataTable table1 = new DataTable();
adapter1.Fill(table1);
DropDownList1.DataSource = table1.DefaultView;
DropDownList1.DataTextField = "Text";
DropDownList1.DataValueField = "ProductId";
DropDownList1.DataBind();
}

using (SqlConnection conn = new SqlConnection("server=(local);database=Northwind;user id=sa;password=sa;min pool size=4;max pool size=100;Connection Lifetime=30;"))
{
    SqlDataAdapter adapter1 = new SqlDataAdapter("Select Top 10 ProductId,ProductName+','+convert(nvarchar,UnitPrice) Text FROM Products", conn);
    DataTable table1 = new DataTable();
    adapter1.Fill(table1);

    DropDownList1.DataSource = table1.DefaultView;
    DropDownList1.DataTextField = "Text";
    DropDownList1.DataValueField = "ProductId";
    DropDownList1.DataBind();
}

方法2：在DataTable中新增一字段

C#代码

using (SqlConnection conn = new SqlConnection("server=(local);database=Northwind;user id=sa;password=sa;min pool size=4;max pool size=100;Connection Lifetime=30;"))
{
SqlDataAdapter adapter1 = new SqlDataAdapter("Select Top 10 ProductId,ProductName,UnitPrice FROM Products", conn);
DataTable table1 = new DataTable();
adapter1.Fill(table1);
table1.Columns.Add("Text", System.Type.GetType("System.String"), "ProductName+'-'+UnitPrice");
DropDownList1.DataSource = table1.DefaultView;
DropDownList1.DataTextField = "Text";
DropDownList1.DataValueField = "ProductId";
DropDownList1.DataBind();
}