如何纠正我这个错误 [英] how to rectify i this errors

问题描述

编译器错误消息:CS0029:无法将类型字符串"隐式转换为"System.DateTime"

源错误:

Compiler Error Message: CS0029: Cannot implicitly convert type ''string'' to ''System.DateTime''

Source Error:

try {                                             // Line 71: 
    mydate3 = (mydate - mydate2).ToString();
    this.Label5.Text = "Time Left: " + mydate3.ToShortTimeString();
} catch (Exception ex) {

编译错误
说明:编译服务该请求所需的资源期间发生错误.请查看以下特定的错误详细信息，并适当地修改您的源代码.

编译器错误消息:CS0266:无法将类型"object"隐式转换为"int".存在显式转换(您是否缺少演员表?)

源错误:

Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0266: Cannot implicitly convert type ''object'' to ''int''. An explicit conversion exists (are you missing a cast?)

Source Error:

foreach (object x_loopVariable in dt.Rows) {                         // Line 84:
    x= x_loopVariable  ;
    if (Convert.ToInt32(x["Selected"]) + 1 == Convert.ToInt32(x["correct"])); {
    marks += 1;

推荐答案

1.您不能使用赋值表达式将一种类型转换为另一种类型(例如string到DateTime)，除非该类型具有可以接受源类型的operator=.

2.执行编译器告诉您的内容.

请查看C#参考手册以获取更多详细信息.

1. You cannot use an assignment expression to convert one type to another (e.g. string to DateTime) unless the type has an operator= that will accept the source type.

2. Do what the compiler tells you.

Check your C# reference manual for further details.

错误:"CS0029:无法将类型"string"隐式转换为"System.DateTime""

原因:您的以下代码.
mydate3 = (mydate - mydate2).ToString();

我猜mydate3的类型是DateTime，并且您正在尝试为其分配类型String的数据.

解决方案:如下修改代码.
mydate3 = mydate - mydate2;

错误:"CS0266:无法将类型"object"隐式转换为"int"."

原因:您的以下代码.可能您正在尝试将DataRow的对象分配给int变量.
x= x_loopVariable ;

Error: "CS0029: Cannot implicitly convert type ''string'' to ''System.DateTime''"

Reason : Your below code.
mydate3 = (mydate - mydate2).ToString();

I guess Type of mydate3 is DateTime, and you are trying to assign a data of Type String to it.

Resolution: Modify your code as below.
mydate3 = mydate - mydate2;

Error: "CS0266: Cannot implicitly convert type ''object'' to ''int''."

Reason: Your below code. Probably you are trying to assign object of DataRow to int variable.
x= x_loopVariable ;

String Gender;
    if (DDGender.SelectedItem.Text  = Convert.ToString("--SELECT--" ))
    {
       Response.Write("Please Select the Gender");
    }
    else if (DDGender.SelectedItem.Text = "MALE")
    {
        Gender = DDGender.SelectedItem.Text;
        Response.Write("Select Gender" +Gender );
    }
    else
    {
        Gender = DDGender.SelectedItem.Text;
        Response.Write("Select Gender" + Gender);
    }


    }
Clarify the error

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