如何通过powershell将多个值参数传递给报告服务报告

Question

我可以毫无问题地将单值参数传递给报告服务。但是我无法弄清楚如何将多值字符串参数发送到报告。在我的报告中，名为“multival”的字段设置为“允许多个值”。 documentation 状态传递 string[] 以获得多个值。我只是无法在 PowerShell 中获得适用于此的语法。下面是一些示例代码。

$multiVal = @('item1','item2','item5','item7');

....

$params[0] = new-Object Microsoft.Reporting.WinForms.ReportParameter("multival", $multiVal, $false);

我花了很多时间搜索互联网，但找不到任何 PowerShell 特定示例来说明如何完成此操作。非常感谢任何帮助。

更新 #1

下面是更完整的示例和错误消息的完整输出。

# Function to save each report as a PDF file
function Generate-Report
{
    Param ($param1, $param2, $param3, $startdate, $enddate)

    # Create a report viewer
    $rv = New-Object Microsoft.Reporting.WinForms.ReportViewer;
    $rv.ServerReport.ReportServerUrl = "http://myserver/reportserver";
    $rv.ServerReport.ReportPath = "/Folder/Folder/Report";
    $rv.ProcessingMode = [Microsoft.Reporting.WinForms.ProcessingMode]::Remote;     
    $rv.ShowParameterPrompts = $false;

    # Need these variables for PDF rendering
    $deviceInfo = $null;
    $mimeType = $null;
    $encoding = $null;
    $extension = $null;
    $streamids = $null;
    $warnings = $null;

    $multival = @('item1','item2','item4','item5','item8','item10'); # This does not work
    #$multival = @('item1');  # This works

    # Set Parameters
    $params = $null;
    $params = New-Object 'Microsoft.Reporting.WinForms.ReportParameter[]' 5
    $params[0] = New-Object Microsoft.Reporting.WinForms.ReportParameter("startdate", $startdate, $false);
    $params[1] = New-Object Microsoft.Reporting.WinForms.ReportParameter("enddate", $enddate, $false);
    $params[2] = New-Object Microsoft.Reporting.WinForms.ReportParameter("param1", $param1, $false);
    $params[3] = New-Object Microsoft.Reporting.WinForms.ReportParameter("param3", $param3, $false);
    $params[4] = New-Object Microsoft.Reporting.WinForms.ReportParameter("multival", $multival, $false);

    $rv.ServerReport.SetParameters($params);
    $rv.ServerReport.Refresh();

    # Render the report as PDF
    $bytes = $null; 
    $bytes = $rv.ServerReport.Render("PDF", $deviceInfo, 
                [ref] $mimeType, 
                [ref] $encoding, 
                [ref] $extension, 
                [ref] $streamids, 
                [ref] $warnings);

    # Save the PDF file to the designated location
    $file = "$outputFolder\$param1 - $param2.pdf";
    $fileStream = New-Object System.IO.FileStream($file, [IO.FileMode]::OpenOrCreate, [IO.FileAccess]::Write, [IO.FileShare]::None)
    $fileStream.Write($bytes, 0, $bytes.Length);
    $fileStream.Close();
}

错误如下：

Exception calling "Render" with "7" argument(s): "This report requires a default or 
user-define value for the report parameter 'multival'. To run or subscribe to this 
report, you must provide a parameter value. (rsReportParameterValueNotSet)"
At C:\MyScript.ps1:85 char:37
+     $bytes = $rv.ServerReport.Render <<<< ("PDF", $deviceInfo,
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

Exception calling "Write" with "3" argument(s): "Buffer cannot be null. Parameter 
name: array"
At C:\MyScript.ps1:95 char:22
+     $fileStream.Write <<<< ($bytes, 0, $bytes.Length);
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

更新 #2

正如 cmets 中所指出的，我需要将 $multival 声明为 StringCollection。一旦我这样做了，代码就起作用了。请参阅下面更新的 sn-p。

$multival = New-Object System.Collections.Specialized.StringCollection
$ret = $multival.Add('item1')
$ret = $multival.Add('item2')
$ret = $multival.Add('item4')
$ret = $multival.Add('item5')
$ret = $multival.Add('item8')
$ret = $multival.Add('item10')

Answer 1

根据 MSDN，ReportParameter.Values 属性属于 [StringCollection] 类型。 PowerShell 无法轻松地将 [String[]] 转换为 [StringCollection]。有关如何在 PowerShell 中使用 [StringCollection] 对象的示例，请参阅 this 文章