.net 调用ReportingService2005.FindItems（）时出错；特别是关于BooleanOperatorEnum参数

在powershell v2中调用ReportingService2005.FindItems（）方法时出现问题

$rs = New-WebServiceProxy -Uri $ReportServerUri -Namespace SSRS.ReportingService2005 -UseDefaultCredential;

$searchCondition = New-Object SSRS.ReportingService2005.SearchCondition
$searchCondition.ConditionSpecified  = $true
$searchCondition.Name = "Name";
$searchCondition.Value = "Sales";
[SSRS.ReportingService2005.SearchCondition[]] $searchConditions = @($searchCondition)

$boolOp = [SSRS.ReportingService2005.BooleanOperatorEnum]::And

#Also tried bellow initialization of enum.
#[SSRS.ReportingService2005.BooleanOperatorEnum] $boolOp = 0

$rs.FindItems("/", $boolOp ,$searchConditions)

执行上述操作会产生以下错误：

无法将“FindItems”的值为“And”的参数“1”转换为类型“SSRS.ReportingService2005.BooleanOperatorEnum”：“无法将值”和“转换为类型”SSRS.ReportingService2005.BooleanOperatorEnum。错误：“从'SSRS.ReportingService2005.BooleanOperatorEnum'转换为'SSRS.ReportingService2005.BooleanOperatorEnum'无效。”

任何帮助都将不胜感激，

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Zach已确定错误与我的webproxy中使用的命名空间参数有关。事实证明，我发布的脚本在会话中第一次被删除时成功运行；在同一powershell会话中连续执行时失败

我发现这篇文章很好地解释了这种情况：

$rs = New-WebServiceProxy -Uri $ReportServerUri -UseDefaultCredential; 

$searchCondition = New-Object Microsoft.PowerShell.Commands.NewWebserviceProxy.AutogeneratedTypes.WebServiceProxy1er_ReportService2005_asmx_WSDL.SearchCondition;
$boolop = New-Object Microsoft.PowerShell.Commands.NewWebserviceProxy.AutogeneratedTypes.WebServiceProxy1er_ReportService2005_asmx_WSDL.BooleanOperatorEnum;