问为什么我的未初始化变量在TryParse中设置了它的值之后又变成未赋值了？

EN

        foreach (string question in questions)
        {
            bool isBool = false;
            // inputBool declared here.
            bool inputBool;
            string userInput;

            while (!isBool)
            {
                Console.WriteLine(question);
                userInput = Console.ReadLine();

                // inputBool gets assigned a value here in the TryParse.
                isBool = Boolean.TryParse(userInput, out inputBool);
                if (!isBool) Console.WriteLine("Please respond with 'true' or 'false'.");
            }

            // inputBool is unassigned here!
            answers[askingIndex] = inputBool;
            askingIndex++;
        }