c# - ObjectDataSource 找不到非泛型方法

Question

我有这个 ASP.NET 代码:

<asp:DropDownList 
    ID="ddlBrokers" 
    runat="server" 
    AutoPostBack="true" 
    DataSourceID="srcBrokers" 
    DataTextField="broker" 
    DataValueField="brokerId"
/>

<asp:ObjectDataSource
    id="srcBrokers" 
    TypeName="DatabaseComponent.DBUtil" 
    SelectMethod="GetBrokers" 
    runat="server">
</asp:ObjectDataSource>

我的 DAL 代码:

public DataTable GetBrokers(bool? hasImport=null)
{
    SqlCommand cmd = new SqlCommand("usp_GetBrokers");
    if (hasImport.HasValue)
        cmd.Parameters.AddWithValue("@hasImport", hasImport);
    return FillDataTable(cmd, "brokers");
}

加载表单时出现此错误:

ObjectDataSource 'srcBrokers' could not find a non-generic method 'GetBrokers' that has no parameters.

是我的可选参数导致了问题吗？我该如何解决这个问题？声明性 ASP.NET 代码是否可以包含可选参数？

Answer 1

添加方法:

public DataTable GetBrokers() { 
              return GetBrokers(null);
}

并检查它是否有效？