问题描述
使用System;
使用System.Collections.Generic;
使用System.Linq;
使用System.Text;
命名空间ConsoleApplication49
{
class program
{
static void Main（string [] args）
{
amritEntities context = new amritEntities（）;
Timesheet xyz = new Timesheet（） {projectid =5，moduleid =5，taskid =5};
context.AddToTimesheet（xyz） ;
context.SaveChanges（）;
}
}
}
错误4'ConsoleApplication49.amritEntities'不包含'AddToTimesheet'的定义，也没有扩展名可以找到方法'AddToTimesheet'接受类型'ConsoleApplication49.amritEntities'的第一个参数（你是否缺少using指令或程序集引用？）c：\ usersrs \ user \ document \ visual studio 2010 \Projects \ConsoleApplication49 \ConsoleApplication49 \ Program.cs 16 21 ConsoleApplication49
错误1无法将类型'string'隐式转换为'int？'c：\ usersrs \ user\documents \ visual studio 2010 \Projects\ConsoleApplication49 \ConsoleApplication49 \Program.cs 13 56 ConsoleApplication49
错误2无法将类型'string'隐式转换为'int？'c：\ usersrs \ user \\ \\做cuments \visual studio 2010 \Projects\ConsoleApplication49 \ConsoleApplication49 \Program.cs 13 70 ConsoleApplication49
错误3无法将类型'string'隐式转换为'int？'c：\ users \ user\documents\visual studio 2010 \Projects \ConsoleApplication49 \ConsoleApplication49 \Program.cs 13 82 ConsoleApplication49
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication49
{
class Program
{
static void Main(string[] args)
{
amritEntities context = new amritEntities();
Timesheet xyz = new Timesheet(){ projectid="5", moduleid="5" ,taskid="5"};
context.AddToTimesheet(xyz);
context.SaveChanges();
}
}
}
Error4'ConsoleApplication49.amritEntities' does not contain a definition for 'AddToTimesheet' and no extension method 'AddToTimesheet' accepting a first argument of type 'ConsoleApplication49.amritEntities' could be found (are you missing a using directive or an assembly reference?)c:\users\user\documents\visual studio 2010\Projects\ConsoleApplication49\ConsoleApplication49\Program.cs1621ConsoleApplication49
Error1Cannot implicitly convert type 'string' to 'int?'c:\users\user\documents\visual studio 2010\Projects\ConsoleApplication49\ConsoleApplication49\Program.cs1356ConsoleApplication49
Error2Cannot implicitly convert type 'string' to 'int?'c:\users\user\documents\visual studio 2010\Projects\ConsoleApplication49\ConsoleApplication49\Program.cs1370ConsoleApplication49
Error3Cannot implicitly convert type 'string' to 'int?'c:\users\user\documents\visual studio 2010\Projects\ConsoleApplication49\ConsoleApplication49\Program.cs1382ConsoleApplication49
推荐答案
xyz.AddToTimeTimesheet(context);
仍然得到转换为字符串错误
啊！
这是一个不同的问题！
这可能在这一行：
"still getting the convert to string error"
Ah!
That's a different problem!
That's probably in this line:
Timesheet xyz = new Timesheet(){ projectid="5", moduleid="5" ,taskid="5"};因为你得到它三次，我怀疑所有三个属性都是 int？而不是 string - 并且因为你明确地尝试将它们设置为字符串，你会得到那个错误。
试试这个：
And since you get it three times, I suspect that all three properties are int? rather than string - and since you explicitly try to set them as strings, you will get that error.
Try this:
Timesheet xyz = new Timesheet(){ projectid=5, moduleid=5 ,taskid=5};
但在您的真实世界代码中，您几乎肯定会从用户那里获得这些代码as strings：在这种情况下使用int.TryParse转换为整数（报告任何验证问题），然后将整数值传递给Timesheet构造函数。
But in your "real world" code you almost certainly are getting these from a user as strings: in which case use int.TryParse to convert then to integers (reporting any validation problems) and then pass the integer values to your Timesheet constructor.
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