Fix bug in SetVariableAsync for strongly typed values

Author: andyleejordan

src/PowerShellEditorServices/Services/DebugAdapter/DebugService.cs

@@ -457,22 +457,25 @@ public async Task<string> SetVariableAsync(int variableContainerReferenceId, str
 
             if (argTypeConverterAttr is not null)
             {
+                // PSVariable *is* strongly typed, so we have to convert it.
                 _logger.LogTrace($"Setting variable '{name}' using conversion to value: {expressionResult ?? "<null>"}");
 
-                // TODO: This is throwing a 'PSInvalidOperationException' thus causing
-                // 'DebuggerSetsVariablesWithConversion' to fail.
-                psVariable.Value = await _executionService.ExecuteDelegateAsync(
-                    "PS debugger argument converter",
-                    ExecutionOptions.Default,
-                    (pwsh, _) =>
-                    {
-                        var engineIntrinsics = (EngineIntrinsics)pwsh.Runspace.SessionStateProxy.GetVariable("ExecutionContext");
-
-                        // TODO: This is almost (but not quite) the same as LanguagePrimitives.Convert(), which does not require the pipeline thread.
-                        //       We should investigate changing it.
-                        return argTypeConverterAttr.Transform(engineIntrinsics, expressionResult);
-                    },
+                // NOTE: We use 'Get-Variable' here instead of 'SessionStateProxy.GetVariable()'
+                // because we already have a pipeline running (the debugger) and the latter cannot
+                // run concurrently (threw 'NoSessionStateProxyWhenPipelineInProgress').
+                IReadOnlyList<EngineIntrinsics> results = await _executionService.ExecutePSCommandAsync<EngineIntrinsics>(
+                    new PSCommand()
+                        .AddCommand(@"Microsoft.PowerShell.Utility\Get-Variable")
+                        .AddParameter("Name", "ExecutionContext")
+                        .AddParameter("ValueOnly"),
                     CancellationToken.None).ConfigureAwait(false);
+                EngineIntrinsics engineIntrinsics = results.Count > 0
+                    ? results[0]
+                    : throw new Exception("Couldn't get EngineIntrinsics!");
+
+                // TODO: This is almost (but not quite) the same as 'LanguagePrimitives.Convert()',
+                // which does not require the pipeline thread. We should investigate changing it.
+                psVariable.Value = argTypeConverterAttr.Transform(engineIntrinsics, expressionResult);
             }
             else
             {
@@ -642,7 +645,7 @@ private Task<VariableContainerDetails> FetchVariableContainerAsync(string scope)
 
         private async Task<VariableContainerDetails> FetchVariableContainerAsync(string scope, bool autoVarsOnly)
         {
-            PSCommand psCommand = new PSCommand().AddCommand("Get-Variable").AddParameter("Scope", scope);
+            PSCommand psCommand = new PSCommand().AddCommand(@"Microsoft.PowerShell.Utility\Get-Variable").AddParameter("Scope", scope);
 
             var scopeVariableContainer = new VariableContainerDetails(nextVariableId++, "Scope: " + scope);
             variables.Add(scopeVariableContainer);

test/PowerShellEditorServices.Test/Debugging/DebugServiceTests.cs

@@ -613,7 +613,7 @@ await debugService.SetLineBreakpointsAsync(
             Assert.Equal(newGlobalIntValue, intGlobalVar.ValueString);
         }
 
-        [Fact(Skip = "Variable conversion is broken")]
+        [Fact]
         public async Task DebuggerSetsVariablesWithConversion()
         {
             await debugService.SetLineBreakpointsAsync(
@@ -628,7 +628,7 @@ await debugService.SetLineBreakpointsAsync(
             VariableDetailsBase[] variables = GetVariables(VariableContainerDetails.LocalScopeName);
 
             // Test set of a local string variable (not strongly typed but force conversion)
-            const string newStrValue = "False";
+            const string newStrValue = "\"False\"";
             const string newStrExpr = "$false";
             VariableScope localScope = Array.Find(scopes, s => s.Name == VariableContainerDetails.LocalScopeName);
             string setStrValue = await debugService.SetVariableAsync(localScope.Id, "$strVar2", newStrExpr).ConfigureAwait(true);