C# 从下拉列表中合并数据文本字段中数据表中的 2 列
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时间：2020-08-09 06:40:14 来源:igfitidea点击:
Merge 2 columns from datatable in datatextfield from dropdownlist
提问by Alex
var id = Session["staff_id"].ToString()
//I have datatable with 5 columns
DataTable dt = function_return_Datatable(id);
dropdownlist1.DataSource = dt;
/*in DataTextField I want to merge two columns of DataTable, dt.columns [1] is First Name and dt.columns [2] is LastName*/
//I tried this way to merge them, but no results
dropdownlist1.DataTextField = dt.Columns[1].ToString()+" "+dt.Columns[2].ToString();
dropdownlist1.DataValueField = dt.Columns[0].ToString();
dropdownlist1.DataBind();
Any ideas for how to merge these two columns?
关于如何合并这两列的任何想法？
采纳答案by vc 74
You'll need a full name column in your data table as DataTextField can refer to only one single field:
您的数据表中需要一个全名列，因为 DataTextField 只能引用一个字段：
DataTable dt = function_return_Datatable(id);
dt.Columns.Add("FullName", typeof(string), "FirstName + ' ' + LastName");
dropdownlist1.DataSource = dt;
dropdownlist1.DataTextField = "FullName";
dropdownlist1.DataValueField = "ID";
dropdownlist1.DataBind();
Should do it
应该做
(you could also add this column in your SQL query)
（您也可以在 SQL 查询中添加此列）
