創建方法委托，我遇到了一個問題：
D_AmortizationCalsAsync d_AmortizationCalsAsync = AmortizationCalsAsync; // here i have error
public delegate Func<Task<decimal>> D_AmortizationCalsAsync(int amortization, int installmentNumber);
public async Task<decimal> AmortizationCalsAsync(int amortization, int installmentNumber)
{
(...)
}
Tak AmortizationCalsAsync (int, int) 回傳型別錯誤
https://docs.microsoft.com/en-us/dotnet/csharp/misc/cs0407?f1url=?appId=roslyn&k=k(CS0407)
uj5u.com熱心網友回復：
AmortizationCalsAsync回傳 a Task<decimal>，而不是 a Func<Task<decimal>>。如果要將其分配給委托，則需要更改委托的型別：
public delegate Task<decimal> D_AmortizationCalsAsync(int amortization, int installmentNumber);
或者使用匿名 lambda 創建一個具有正確簽名和回傳型別的函式（即一個接受 2 個整數并回傳一個沒有引數和Task<decimal>回傳型別的 func 的函式）：
D_AmortizationCalsAsync d_AmortizationCalsAsync =
(a, i) => () => AmortizationCalsAsync(a, i);
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