type or namespace Task could not be found

Question

I'm using Microsoft Visual Studio express for windows phone, when i use TASK in my app, i get the above mentioned error, even System.Threading.Tasks is also not found. What could be my problem??

Answer 1

右键单击Task，选择Resolve> System.Threading.Tasks.Task

Answer 2

You need to target at least .NET Framework 4 in your project. You can change this under project properties.

Also, changing the target will not add the reference for the library, so you have to do this manually after changing the target framework.

Answer 3

在WP8（测试设备Lumia 920）上，按照以下说明解决了我的问题： http ： //www.nuget.org/packages/Microsoft.Bcl.Async