Synchronous operations are disallowed. Call WriteAsync or set AllowSync...

Little scum · Posted on 3/16/2023 9:09:31 PM

ASP.NET Core 3.0 project uses responsePageStream.Write to output bytes of error as follows:

InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead.

Solution 1 (recommend）：

Change to an asynchronous method call, the code is as follows:

Solution 2:

Globally modify the AllowSynchronousIO configuration to allow requests for synchronous IO response actions, with the following code:

Solution 3:

Local variable modification, modify the AllowSynchronousIO configuration for a single request, the code is as follows:

(End)

Little scum · Posted on 3/16/2023 9:11:29 PM

[Source] Synchronous operations are disallowed. Call WriteAsync or set AllowSync...