ComboBox没有正确填充

Question

我使用以下代码填充组合框。它显示：System.Data.DataRowView而不是其中的实际列值。我缺少什么？

        string Query = "SELECT institutename FROM institutemaster";
        DataSet ds = new DataSet();
        MySqlDataAdapter da = new MySqlDataAdapter(Query, ConnectionClass.CN);
        da.Fill(ds, "Institutes");
        cmbInstitutes.DataSource = ds.Tables["Institutes"];

Answer 1

您可能需要设置DisplayMember和ValueMember属性：

cmbInstitutes.DisplayMember = "NameOfTheColumnForText";
cmbInstitutes.ValueMember = "NameOfTheColumnForValues";

或DataValueField和DataTextField如果它是ASP.NET应用程序。

Answer 2

您可以使用以下代码在同一个组合框中填充两列。

string Query = "SELECT (institutename +', '+city) as Institute  FROM institutemaster";
 DataSet ds = new DataSet();   
 MySqlDataAdapter da = new MySqlDataAdapter(Query, ConnectionClass.CN);        
da.Fill(ds, "Institutes");    
cmbInstitutes.DataSource = ds.Tables["Institutes"];
cmbInstitutes.DisplayMember = "Institute";
cmbInstitutes.ValueMember = "Institute";