函数不会在所有代码路径上都返回值。当使用结果时，可能会在运行时发生 null 引用异常

Question

函数代码为：

 Function result_ss() As String
        If RadioButton_ss1.Checked = True Then result_ss = "1"
        If RadioButton_ss2.Checked = True Then result_ss = "2"
    End Function

求大神帮忙

Answer 1

 Function result_ss() As String
        If RadioButton_ss1.Checked = True Then result_ss = "1"
        If RadioButton_ss2.Checked = True Then result_ss = "2"
    End Function
        改
        Function result_ss() As String
            result_ss = "";
        If RadioButton_ss1.Checked = True Then result_ss = "1"
        If RadioButton_ss2.Checked = True Then result_ss = "2"
    End Function