Fixes issue updating files when proxy is running. Closes #244 (#250)

* Fixes issue updating files when proxy is running. Closes #244

* Reoslve PR comments

* Resolve PR comments (again)

Author: garrytrinder

msgraph-developer-proxy-plugins/MockResponses/MockResponsesLoader.cs

@@ -3,6 +3,7 @@
 
 using Microsoft.Graph.DeveloperProxy.Abstractions;
 using System.Text.Json;
+using System.IO;
 
 namespace Microsoft.Graph.DeveloperProxy.Plugins.MocksResponses;
 
@@ -26,12 +27,16 @@ public void LoadResponses() {
         }
 
         try {
-            var responsesString = File.ReadAllText(_responsesFilePath);
-            var responsesConfig = JsonSerializer.Deserialize<MockResponseConfiguration>(responsesString);
-            IEnumerable<MockResponse>? configResponses = responsesConfig?.Responses;
-            if (configResponses is not null) {
-                _configuration.Responses = configResponses;
-                _logger.LogInfo($"Mock responses for {configResponses.Count()} url patterns loaded from {_configuration.MocksFile}");
+            using (FileStream stream = new FileStream(_responsesFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) {
+                using (StreamReader reader = new StreamReader(stream)) {
+                    var responsesString = reader.ReadToEnd();
+                    var responsesConfig = JsonSerializer.Deserialize<MockResponseConfiguration>(responsesString);
+                    IEnumerable<MockResponse>? configResponses = responsesConfig?.Responses;
+                    if (configResponses is not null) {
+                            _configuration.Responses = configResponses;
+                            _logger.LogInfo($"Mock responses for {configResponses.Count()} url patterns loaded from {_configuration.MocksFile}");
+                    }
+                }
             }
         }
         catch (Exception ex) {

msgraph-developer-proxy-plugins/RandomErrors/GenericErrorResponsesLoader.cs

@@ -3,6 +3,7 @@
 
 using Microsoft.Graph.DeveloperProxy.Abstractions;
 using System.Text.Json;
+using System.IO;
 
 namespace Microsoft.Graph.DeveloperProxy.Plugins.RandomErrors;
 
@@ -26,12 +27,16 @@ public void LoadResponses() {
         }
 
         try {
-            var responsesString = File.ReadAllText(_errorsFile);
-            var responsesConfig = JsonSerializer.Deserialize<GenericRandomErrorConfiguration>(responsesString);
-            IEnumerable<GenericErrorResponse>? configResponses = responsesConfig?.Responses;
-            if (configResponses is not null) {
-                _configuration.Responses = configResponses;
-                _logger.LogInfo($"Error responses for {configResponses.Count()} url patterns loaded from from {_configuration.ErrorsFile}");
+            using (FileStream stream = new FileStream(_errorsFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) {
+                using (StreamReader reader = new StreamReader(stream)) {                
+                    var responsesString = reader.ReadToEnd();
+                    var responsesConfig = JsonSerializer.Deserialize<GenericRandomErrorConfiguration>(responsesString);
+                    IEnumerable<GenericErrorResponse>? configResponses = responsesConfig?.Responses;
+                    if (configResponses is not null) {
+                        _configuration.Responses = configResponses;
+                        _logger.LogInfo($"Error responses for {configResponses.Count()} url patterns loaded from from {_configuration.ErrorsFile}");
+                    }
+                }
             }
         }
         catch (Exception ex) {