Fix blob container connection string format exception

Co-authored-by: eerhardt <[email protected]>

Author: Copilot

src/Aspire.Hosting.Azure.Storage/AzureBlobStorageResource.cs

@@ -39,7 +39,7 @@ internal ReferenceExpression GetConnectionString(string? blobContainerName)
         }
 
         ReferenceExpressionBuilder builder = new();
-        builder.Append($"{Endpoint}=\"{ConnectionStringExpression}\";");
+        builder.Append($"{Endpoint}={ConnectionStringExpression};");
 
         if (!string.IsNullOrEmpty(blobContainerName))
         {

src/Components/Aspire.Azure.Storage.Blobs/AzureBlobStorageContainerSettings.cs

@@ -27,11 +27,25 @@ void IConnectionStringSettings.ParseConnectionString(string? connectionString)
         const string Endpoint = nameof(Endpoint);
         const string ContainerName = nameof(ContainerName);
 
-        DbConnectionStringBuilder builder = new() { ConnectionString = connectionString };
-        if (builder.TryGetValue(Endpoint, out var endpoint) && builder.TryGetValue(ContainerName, out var containerName))
+        try
         {
-            ConnectionString = endpoint.ToString();
-            BlobContainerName = containerName.ToString();
+            DbConnectionStringBuilder builder = new() { ConnectionString = connectionString };
+            if (builder.TryGetValue(Endpoint, out var endpoint) && builder.TryGetValue(ContainerName, out var containerName))
+            {
+                // Remove any quotes around the endpoint value
+                string endpointStr = endpoint?.ToString() ?? string.Empty;
+                if (endpointStr.StartsWith("\"") && endpointStr.EndsWith("\"") && endpointStr.Length >= 2)
+                {
+                    endpointStr = endpointStr.Substring(1, endpointStr.Length - 2);
+                }
+
+                ConnectionString = endpointStr;
+                BlobContainerName = containerName?.ToString();
+            }
+        }
+        catch (ArgumentException)
+        {
+            throw;
         }
     }
 }

tests/Aspire.Azure.Storage.Blobs.Tests/AzureBlobStorageContainerSettingsTests.cs

@@ -49,4 +49,17 @@ public void ParseConnectionString_valid_input(string connectionString)
         Assert.Equal("https://example.blob.core.windows.net", settings.ConnectionString);
         Assert.Equal("my-container", settings.BlobContainerName);
     }
+    
+    [Fact]
+    public void ParseConnectionString_with_quoted_endpoint()
+    {
+        // This test reproduces the issue where the connection string has quotes around the endpoint value
+        var settings = new AzureBlobStorageContainerSettings();
+        string connectionString = "Endpoint=\"https://example.blob.core.windows.net\";ContainerName=my-container";
+
+        ((IConnectionStringSettings)settings).ParseConnectionString(connectionString);
+
+        Assert.Equal("https://example.blob.core.windows.net", settings.ConnectionString);
+        Assert.Equal("my-container", settings.BlobContainerName);
+    }
 }