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GUID as String Parameter passed as Null

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Chris asked on 20 Feb 2014, 03:11 PM
When I pass a parameter through, for use in the Select statement of a SQL Datasource, it gets passed as Null, even though it appears correctly when I set the parameter to visible (for testing).

The parameter is a Guid which I convert to a string before passing and then convert back to a Guid in the Select statement.

If I remove the Where clause in the Select statement, its fine.

I am using version and have run the upgrade wizard. I have tried putting single quotes around the Guid.

I pass the parameter as follows:

        public TypeReportSource ReportSource
                TypeReportSource reportSource = new TypeReportSource { TypeName = "AcumenSynergy.Reporting.PurchaseOrderLinesOutstanding, AcumenSynergy.Reporting"};
                reportSource.Parameters.Add("ProjectID", this.SelectedProjectID.ToString());
                return reportSource;

<div id="projectIDSelector">
    @Html.LabelFor(model => model.SelectedProjectID)
    @Html.DropDownListFor(model => model.SelectedProjectID, Model.ProjectItems, new { id = "projectID", title = "Select the Project" })


$('#projectID').change(function () {
    var viewer = $("#reportViewer1").data("telerik_ReportViewer");
        report: viewer.reportSource().report,
        parameters: { ProjectID: $(this).val() }

Select Statement in SQL Data Source
Select * from dbo.Projects  where ProjectID = (SELECT Convert(uniqueidentifier,@ProjectID)) 

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answered on 21 Feb 2014, 05:19 PM
Hi Chris,

This is a quote from your ticket on the same topic:

"Using the code snippets from your forum post I created the attached sample project, and there are no issues loading data based on uniqueidentifier column. Note you can use string directly in the SQL query e.g.:
where rowguid like '7D3FD384-4F29-484B-86FA-4206E276FE58'
Please verify the query returns records with the selected value.

Test displaying the report with other report viewer, e.g. Windows Forms ReportViewer, and if the report is displayed correctly check if Newtosoft.Json.dll is installed in the GAC of the machine, and remove it from there. Then update the reference in the project using Json Nuget package

Let us continue the discussion in your ticket, until it is resolved. Finally we can update the forum thread with the result.


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