From a27f86e3bf5f909be6cd32f30f6db294cd6e12b3 Mon Sep 17 00:00:00 2001
From: Jason Malinowski <jason.malinowski@microsoft.com>
Date: Fri, 24 Jan 2020 13:56:58 -0800
Subject: [PATCH] Remove duplicate project existence check

CheckContainsProject asserts the project exists, no need to duplicate
it.
---
 .../Core/Portable/Workspace/Solution/SolutionState.cs      | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/src/Workspaces/Core/Portable/Workspace/Solution/SolutionState.cs b/src/Workspaces/Core/Portable/Workspace/Solution/SolutionState.cs
index 00bbabd0a44..5f541133a3d 100644
--- a/src/Workspaces/Core/Portable/Workspace/Solution/SolutionState.cs
+++ b/src/Workspaces/Core/Portable/Workspace/Solution/SolutionState.cs
@@ -1217,12 +1217,7 @@ public SolutionState AddDocuments(ImmutableArray<DocumentInfo> documentInfos)
             foreach (var documentInfosInProject in documentInfosByProjectId)
             {
                 CheckContainsProject(documentInfosInProject.Key);
-                var oldProject = this.GetProjectState(documentInfosInProject.Key);
-
-                if (oldProject == null)
-                {
-                    throw new InvalidOperationException(string.Format(WorkspacesResources._0_is_not_part_of_the_workspace, documentInfosInProject.Key));
-                }
+                var oldProject = this.GetProjectState(documentInfosInProject.Key)!;
 
                 var newDocumentStatesForProjectBuilder = ArrayBuilder<T>.GetInstance();
 
-- 
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