c# – ReportingServices SetReportDataSources您正在尝试项错误

The operation you are attempting on item is not allowed for this item type.

也许我有一些混合的东西,但我无法确定它.

filepath = / Base / Vendor(报告的完整路径);
datasource = IBBase

public static void UpdateDataSource(string filepath,string datasource)
    {
        ReportingService rs = new ReportingService();
        rs.Credentials = System.Net.CredentialCache.DefaultCredentials;

        ServicesReport.DataSourceReference reference = new ServicesReport.DataSourceReference();
        reference.Reference = filepath;
        ServicesReport.DataSource[] dataSources = new ServicesReport.DataSource[1];
        ServicesReport.DataSource ds = new ServicesReport.DataSource();
        ds.Item = (ServicesReport.DataSourceDefinitionOrReference)reference;
        ds.Name = datasource;
        dataSources[0] = ds;

        try
        {
            rs.SetReportDataSources(filepath,dataSources);
            Console.WriteLine("New reference set for the report.");

        }

        catch (SoapException e) 
        {
            Console.WriteLine(e.Detail.InnerXml.ToString());
        }
    }