我在 GridView 控件中有一个 TemplateField,例如:
<asp:TemplateField ItemStyle-Width="150px">
<ItemTemplate>
<asp:DropDownList ID="ddlFields" runat="server" DataSourceID="odsOperator" DataTextField="Text" DataValueField="Value" />
<asp:HiddenField ID="hfFieldType" runat="server" Value='<%# Eval("FieldType")%>' />
</ItemTemplate>
</asp:TemplateField>
我有一个要从 ObjectDataSource 填充的下拉列表,但是对于每一行我想传递一个 Select 参数,以便它填充正确的值
<asp:ObjectDataSource ID="odsOperator" runat="server" TypeName="OperatorFieldsDAO"
SelectMethod="FindByType">
<SelectParameters>
<asp:ControlParameter ControlID="hfFieldType" Type="String" Name="Type" PropertyName="Value" />
</SelectParameters>
</asp:ObjectDataSource>
我的 OperatorFieldsDAO 类是:
public class OperatorFieldsDAO
{
private List<OperatorField> OperatorFields
{
get
{
List<OperatorField> operatorFields = HttpContext.Current.Session["OperatorFields"] as List<OperatorField>;
if (operatorFields == null)
{
operatorFields = new List<OperatorField>();
operatorFields.Add(new OperatorField("string", "contains", "C"));
operatorFields.Add(new OperatorField("string", "begins with", "BW"));
operatorFields.Add(new OperatorField("string", "is equal to", "E"));
operatorFields.Add(new OperatorField("string", "is not equal to", "NE"));
operatorFields.Add(new OperatorField("string", "is less than", "L"));
operatorFields.Add(new OperatorField("string", "is greater than", "G"));
operatorFields.Add(new OperatorField("string", "is less than or equal to", "LE"));
operatorFields.Add(new OperatorField("string", "is greater than or equal to", "GE"));
operatorFields.Add(new OperatorField("string", "is from", "F"));
operatorFields.Add(new OperatorField("string", "is between", "B"));
operatorFields.Add(new OperatorField("string", "is nothing", "N"));
operatorFields.Add(new OperatorField("string", "is something", "S"));
operatorFields.Add(new OperatorField("number", "is the same as", "S"));
operatorFields.Add(new OperatorField("number", "is not the same as", "S"));
operatorFields.Add(new OperatorField("number", "is one of", "S"));
operatorFields.Add(new OperatorField("number", "is not one of", "S"));
operatorFields.Add(new OperatorField("number", "is nothing", "N"));
operatorFields.Add(new OperatorField("number", "is something", "S"));
}
return operatorFields;
}
}
public OperatorFieldsDAO() { }
[DataObjectMethod(DataObjectMethodType.Select)]
public IEnumerable<OperatorField> FindAll()
{
return this.OperatorFields;
}
[DataObjectMethod(DataObjectMethodType.Select)]
public IEnumerable<OperatorField> FindByType(String type)
{
List<OperatorField> r = new List<OperatorField>();
foreach (OperatorField f in this.OperatorFields)
if (f.Type == type)
r.Add(f);
return r;
}
}
所有这些都是为了告诉你我收到了一个错误:
在 ControlParameter 'Type' 中找不到控件 'hfFieldType'。
我究竟做错了什么?
我是否需要使用OnRowDataBound方法以编程方式传递所选参数?