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Code Contracts and Tasks


Code contracts and async don't go together well, so you can't really use Contract.Ensures.

There is however a workaround. You can change your method from a Task-returning method to an async one (which would be cleaner anyway) and use Contract.Assume instead:

public async Task LoadAppModel()
{
    var userTask = store.GetUserAsync();
    var securityTask = store.GetSecurityAsync();
    var settingsTask =
store.GetLocalSettingsAsync();
    await Task.WhenAll(userTask,
securityTask,settingsTask);

    app.User = userTask.Result;
    app.Security = securityTask.Result;
    app.LocalSettings = settingsTask.Result;

    Contract.Assume(app.User != null);
    Contract.Assume(app.Security != null);
    Contract.Assume(app.LocalSettings != null);
}

Categories : C#

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