helpers/Convert-RetrievalIncludeExpression.ps1
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#Requires -Version 3.0 <# Convert-RetrievalIncludeExpression.ps1 Copyright (c) 2017 karamem0 This software is released under the MIT License. https://github.com/karamem0/SPClient/blob/master/LICENSE #> function Convert-RetrievalIncludeExpression { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [string] $InputString, [Parameter(Mandatory = $true)] [System.Linq.Expressions.Expression] $Expression ) process { if (-not $InputString.StartsWith('Include(')) { throw "Cannot convert expression because 'InputString' parameter does not start with 'Include('." } if (-not $InputString.EndsWith(')')) { throw "Cannot convert expression because 'InputString' parameter does not end with ')'." } $InputString = $InputString.Substring(8, $InputString.Length - 9) $ItemType = $Expression.Type.BaseType.GenericTypeArguments[0] $FuncType = [type]'System.Func`2' | &{ process { $_.MakeGenericType($ItemType, [object]) } } $ExprType = [type]'System.Linq.Expressions.Expression`1' | &{ process { $_.MakeGenericType($FuncType) } } $ListType = [type]'System.Collections.Generic.List`1' | &{ process { $_.MakeGenericType($ExprType) } } $ParamExpr = [System.Linq.Expressions.Expression]::Parameter($ItemType, $ItemType.Name) $LambdaExprs = New-Object $ListType $Splits = Split-RetrievalExpressionString -InputString $InputString -Separator ',' if ($Splits -ne '*') { foreach ($Split in $Splits) { $PropExpr = Convert-RetrievalMemberAccessExpression -InputString $Split -Expression $ParamExpr $CastExpr = [System.Linq.Expressions.Expression]::Convert($PropExpr, [object]) $LambdaExpr = [System.Linq.Expressions.Expression]::Lambda($FuncType, $CastExpr, $ParamExpr) $LambdaExprs.Add($LambdaExpr) } } $ExtType = [Microsoft.SharePoint.Client.ClientObjectQueryableExtension] $ArrayExpr = [System.Linq.Expressions.Expression]::NewArrayInit($ExprType, $LambdaExprs.ToArray()) if ($Splits -contains '*') { $IncludeExpr = [System.Linq.Expressions.Expression]::Call( ` $ExtType.GetMethod('IncludeWithDefaultProperties').MakeGenericMethod($ItemType), ` [System.Linq.Expressions.Expression[]]@($Expression, $ArrayExpr) ) Write-Output $IncludeExpr } else { $IncludeExpr = [System.Linq.Expressions.Expression]::Call( ` $ExtType.GetMethod('Include').MakeGenericMethod($ItemType), ` [System.Linq.Expressions.Expression[]]@($Expression, $ArrayExpr) ) Write-Output $IncludeExpr } } } |