Question

我正在尝试使用SQL数据库中表的名称填充下拉列表。这是我的代码尝试，但是当我调用它并且下拉列表保持为空时没有发生任何事情。

public  void FillDropDownList()
    {
        String connString = "myConnectionString";

        //**STRING UPDATED**
        String Query = "SELECT * FROM information_schema.tables";

        using (var cn = new SqlConnection(connString))
        {
            cn.Open();
            DataTable dt = new DataTable();
            try
            {
                SqlCommand cmd = new SqlCommand(Query, cn);
                SqlDataReader myReader = cmd.ExecuteReader();
                dt.Load(myReader);
            }
            catch (SqlException e)
            {
                //to be completed
            }

            radDropDownList1.DataSource = dt;
            radDropDownList1.ValueMember = "TABLES_NAME";
            radDropDownList1.DisplayMember = "TABLES_NAME";
        }
    }

如何使用上述查询填充下拉列表？

Answer 1

您的查询不正确，需要

SELECT TABLE_NAME 
FROM INFORMATION_SCHEMA.TABLES 
WHERE TABLE_TYPE = 'BASE TABLE'

Answer 2

问题在于您使用ValueMember和DisplayMember的字符串，请替换下面的

 radDropDownList1.ValueMember = "TABLES_NAME";
 radDropDownList1.DisplayMember = "TABLES_NAME";

与

 radDropDownList1.ValueMember = "TABLE_NAME";
 radDropDownList1.DisplayMember = "TABLE_NAME";

使用数据库表名填充下拉列表

2 个答案: