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AsyncAwaitDecompiler not work for methods in struct. #1782

yyjdelete opened this issue Nov 4, 2019 · 0 comments


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@yyjdelete yyjdelete commented Nov 4, 2019

Tested with master(

Not work for async Task and IAsyncEnumerable(#1730), but IEnumerable works well.

    public struct TestStruct
        int i;
        public async IAsyncEnumerable<int> Test4(TestStruct xx)
            await Task.Yield();
            yield return this.i;
            yield return xx.i;
        public async Task<int> Test(TestStruct xx)
            await Task.Yield();
            return this.i + xx.i;

Seems the only difference in IL is that the version for struct will add an ldobj between ldarg.0 and stfld, and the same logic should be used for AsyncAwaitDecompiler.

+ldobj ConsoleApp1.TestStruct
stfld valuetype ConsoleApp1.TestStruct ConsoleApp1.TestStruct/'<Test>d__2'::'<>4__this'

} else if (value is LdObj ldobj && ldobj.Target.MatchLdThis()) {
// copy of 'this' in struct
fieldToParameterMap[(IField)storedField.MemberDefinition] = ((LdLoc)ldobj.Target).Variable;
} else {

@dgrunwald dgrunwald closed this in eaecedd Nov 5, 2019
fengjixuchui added a commit to fengjixuchui/ILSpy that referenced this issue Nov 6, 2019
Fix icsharpcode#1782: AsyncAwaitDecompiler for methods in struct
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