helpers/Convert-SPClientIncludeExpression.ps1
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#Requires -Version 3.0 # Convert-SPClientIncludeExpression.ps1 # # Copyright (c) 2017 karamem0 # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in all # copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. function Convert-SPClientIncludeExpression { [CmdletBinding()] param ( [Parameter(Position = 0, Mandatory = $true)] [String] $InputString, [Parameter(Position = 1, 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 ')'." } $buffer = '' $depth = 0 $properties = New-Object System.Collections.ArrayList for ($index = 8; $index -lt $InputString.Length - 1; $index += 1) { if ($InputString[$index] -eq ',') { if ($depth -eq 0) { $properties.Add($buffer.Trim()) | Out-Null $buffer = '' continue } } if ($InputString[$index] -eq '.') { if ($InputString.Substring($index + 1).StartsWith('Include(')) { $depth += 1 } } if ($InputString[$index] -eq ')') { $depth -= 1 } $buffer += $InputString[$index] } if ($depth -ne 0) { throw 'Cannot convert expression because braces is not closed.' } $properties.Add($buffer) | Out-Null $itemType = $Expression.Type.BaseType.GenericTypeArguments[0] $funcType = [Type]'System.Func`2' | ForEach-Object { $_.MakeGenericType($itemType, [Object]) } $exprType = [Type]'System.Linq.Expressions.Expression`1' | ForEach-Object { $_.MakeGenericType($funcType) } $paramExpr = [System.Linq.Expressions.Expression]::Parameter($itemType, $itemType.Name) $lambdaExprArray = $properties | ForEach-Object { $propExpr = Convert-SPClientMemberAccessExpression -InputString $_ -Expression $paramExpr $castExpr = [System.Linq.Expressions.Expression]::Convert($propExpr, [Object]) $lambdaExpr = [System.Linq.Expressions.Expression]::Lambda($funcType, $castExpr, $paramExpr) Write-Output $lambdaExpr } $arrayExpr = [System.Linq.Expressions.Expression]::NewArrayInit($exprType, [System.Linq.Expressions.Expression[]]$lambdaExprArray) $includeExpr = [System.Linq.Expressions.Expression]::Call( ` [Microsoft.SharePoint.Client.ClientObjectQueryableExtension].GetMethod('Include').MakeGenericMethod($itemType), ` [System.Linq.Expressions.Expression[]]@($Expression, $arrayExpr) ) Write-Output $includeExpr } } |