Question

我正在创建一个初学者级项目，创建一个使用Visual Studio和Windows窗体计算工作者工作时间的UI。我的错误在以下函数中，我尝试将值分配给文本框。所有“ToDouble”显示错误类“System :: String”没有成员“ToDouble”，并且朝向末尾（S“F”）显示标识符S是未定义和预期的）

void CalculateWeeklyHours(void)
         {
             double monday, tuesday, wednesday, thursday,
       friday, saturday, sunday, totalHours;

monday     = this->txtMonday->Text->ToDouble(0);
tuesday    = this->txtTuesday->Text->ToDouble(0);
wednesday  = this->txtWednesday->Text->ToDouble(0);
thursday   = this->txtThursday->Text->ToDouble(0);
friday     = this->txtFriday->Text->ToDouble(0);
saturday   = this->txtSaturday->Text->ToDouble(0);
sunday     = this->txtSunday->Text->ToDouble(0);

totalHours = monday + tuesday + wednesday + thursday +
             friday + saturday + sunday;
this->txtTotalHours->Text = totalHours.ToString(S"F");
             throw(gcnew System::NotImplementedException);
         }

这里的完整代码http://ideone.com/ySgxp1

c：\ users \ administrator \ documents \ visual studio 2012 \ projects \ form1 \ form1 \ TimeSheet1.h（604）：错误C3921：使用S-prefixed字符串需要/ clr：oldSyntax命令行选项 1 GT;使用/ clr进行编译时，存在从字符串文字类型到System :: String ^的隐式转换。如果需要避免歧义，请转换为System :: String ^ 1＆gt; c：\ users \ administrator \ documents \ visual studio 2012 \ projects \ form1 \ form1 \ TimeSheet1.h（594）：错误C2039：'ToDouble'：不是'System :: String'的成员 1 GT; c：\ program files（x86）\ reference assemblies \ microsoft \ framework.netframework \ v4.5 \ mscorlib.dll：参见'System :: String'的声明 1＆gt; c：\ users \ administrator \ documents \ visual studio 2012 \ projects \ form1 \ form1 \ TimeSheet1.h（595）：错误C2039：'ToDouble'：不是'System :: String'的成员 1 GT; c：\ program files（x86）\ reference assemblies \ microsoft \ framework.netframework \ v4.5 \ mscorlib.dll：参见'System :: String'的声明 1＆gt; c：\ users \ administrator \ documents \ visual studio 2012 \ projects \ form1 \ form1 \ TimeSheet1.h（596）：错误C2039：'ToDouble'：不是'System :: String'的成员 1 GT; c：\ program files（x86）\ reference assemblies \ microsoft \ framework.netframework \ v4.5 \ mscorlib.dll：参见'System :: String'的声明 1＆gt; c：\ users \ administrator \ documents \ visual studio 2012 \ projects \ form1 \ form1 \ TimeSheet1.h（597）：错误C2039：'ToDouble'：不是'System :: String'的成员 1 GT; c：\ program files（x86）\ reference assemblies \ microsoft \ framework.netframework \ v4.5 \ mscorlib.dll：参见'System :: String'的声明 1＆gt; c：\ users \ administrator \ documents \ visual studio 2012 \ projects \ form1 \ form1 \ TimeSheet1.h（598）：错误C2039：'ToDouble'：不是'System :: String'的成员 1 GT; c：\ program files（x86）\ reference assemblies \ microsoft \ framework.netframework \ v4.5 \ mscorlib.dll：参见'System :: String'的声明 1＆gt; c：\ users \ administrator \ documents \ visual studio 2012 \ projects \ form1 \ form1 \ TimeSheet1.h（599）：错误C2039：'ToDouble'：不是'System :: String'的成员 1 GT; c：\ program files（x86）\ reference assemblies \ microsoft \ framework.netframework \ v4.5 \ mscorlib.dll：参见'System :: String'的声明 1＆gt; c：\ users \ administrator \ documents \ visual studio 2012 \ projects \ form1 \ form1 \ TimeSheet1.h（600）：错误C2039：'ToDouble'：不是'System :: String'的成员 1 GT; c：\ program files（x86）\ reference assemblies \ microsoft \ framework.netframework \ v4.5 \ mscorlib.dll：参见'System :: String'的声明 1＆gt; TimeSheet1.cpp（7）：警告C4829：主要功能参数可能不正确。考虑'int main（Platform :: Array ^ argv）'

Answer 1

您应该使用ToDouble(string)课程中的System.Convert。 http://msdn.microsoft.com/en-us/library/zh1hkw6k(v=vs.110).aspx?cs-save-lang=1&cs-lang=cpp#code-snippet-1

函数定义错误，类没有成员

1 个答案: