必须初始化隐式类型的局部变量 [英] Implicitly-typed local variable must be initialized

问题描述

您好我有以下代码，我将读取excel文件数据并填入var。之后，我将根据传入的参数过滤内容。但我一直收到上面标题中显示的错误消息。

以下是我的代码：

Hi I have the following codes in which I will read excel file data and populate into a var. After that I will filter the content based on the passed in parameters. But I keep getting the error message as shown in title above.
Below are my codes:

public ActionResult LoadPackStatusDashboardTotalWeek(string numberFamily, int weekNumber)
{
   string filePathPlannerModule = ConstantValue.PageName.PackStatus.FilePath + "PlannerModule.xlsx";
   var excelDataPlannerModule = MakeCells(filePathPlannerModule);
   var excelDataPlannerModuleNew;//error here

   if (excelDataPlannerModule.ModelList.Count > 0) 
   {
       excelDataPlannerModuleNew = (from x in excelDataPlannerModule.ModelList
                                    where x.CustomerNumber.Equals(numberFamily) &&     x.WeekNumber.Equals(weekNumber)
                                    select new {x.FamilyName, x.WeekNumber}).ToList();
   }

   return Json(new { data = excelDataPlannerModuleNew },JsonRequestBehavior.AllowGet);
}

我的尝试：



1.尝试初始化excelDataPlannerModuleNew。

What I have tried:

1. Tried to initialize excelDataPlannerModuleNew.

推荐答案

突出显示的行无法确定变量的类型。编译器正在寻找右侧不存在的返回类型。

The line that you have highlighted can't determine the type of the variable. The compiler is looking for a return type from the right-hand-side which is not present.

var excelDataPlannerModuleNew = ???;

如果您只是初始化一个您正在做的变量，那么需要明确声明变量类型。



这篇文章解释了单词的不同含义：隐式与显式：有什么区别？ [ ^ ]



当您使用错误消息时，您可以使用谷歌搜索找到更多信息：必须初始化隐式类型的局部变量 [ ^ ]

If you are only initializing a variable, which you are doing, you need to explicitly declare the variable type.

Here is an article that explains the different meanings of the words: Implicit vs. Explicit: What’s the Difference?[^]

You can find lots more information using google search when you use the error message: Implicitly-typed local variable must be initialized[^]

而不是初始化var，试试这个



1.创建一个包含FamilyName，WeekNumber属性的类，让我们调用它MyNewClass

2.更改此行选择新的{x.FamilyName，x.WeekNumber}至

Instead of initializing the var, try this

1. Create a class with FamilyName, WeekNumber property in it, let call it MyNewClass
2. Change this line select new {x.FamilyName, x.WeekNumber} to

select new MyNewClass {FamilyName = x.FamilyName, WeekNumber = x.WeekNumber}

然后更改var excelDataPlannerModuleNew; //这里错误

Then change var excelDataPlannerModuleNew;//error here

IList<MyNewClass> excelDataPlannerModuleNew = new List<MyNewClass>() ;

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