C# foreach 语句不能对“getenumerator”的公共定义类型的变量进行操作
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foreach statement cannot operate on variables of type public definition for 'getenumerator'
提问by atifulrehmankhan khan
Task03Entities.Entites entities = new Task03Entities.Entites();
// Creat a object for my entites class
Task03BAL.BAL bal = new Task03BAL.BAL();
// creat a object of BAL to call Get Data Method
List<Task03Entities.Entites> entitiesList = new List<Task03Entities.Entites>();
// make a list of class Entities
entitiesList = bal.GetData(entities);
// store data in list
ViewState.Add("Products", entitiesList.ToArray());
// use view state to store entitieslist
Task03Entities.Entites[] entitiesArray =(Task03Entities.Entites[])ViewState["Products"];
List<Task03Entities.Entites> ViewStateList =new List<Task03Entities.Entites(entitiesArray);
// so now ViewStateList contain entitieslist data
// Now the Problem which i am facing is
if (Request.QueryString["count"] != null) // this is okay
{
listCount =Convert.ToInt32(Request.QueryString["count"]);
}
for (int i = (listCount * 2)-2; i < listCount * 2; i++)
{
Task03Entities.Entites newViewStateList = new Task03Entities.Entites();
newViewStateList = ViewStateList[i];
// view state contain a list of data here on above line m trying to acess single data
%>
<table>
<%
foreach (Task03Entities.Entites item in newViewStateList)
// on above line i am getting following error message
Compiler Error Message: CS1579: foreach statement cannot operate on variables of type 'Task03Entities.Entites' because 'Task03Entities.Entites' does not contain a public definition for 'GetEnumerator'
编译器错误消息：CS1579：foreach 语句无法对“Task03Entities.Entites”类型的变量进行操作，因为“Task03Entities.Entites”不包含“GetEnumerator”的公共定义
采纳答案by DGibbs
It's simple: Task03Entities.Entitesis not a collection.
很简单：Task03Entities.Entites不是一个集合。
You initialize an object here:
你在这里初始化一个对象：
Task03Entities.Entites newViewStateList = new Task03Entities.Entites();
And then attempt to iterate over it as if it were a collection:
然后尝试迭代它，就好像它是一个集合：
foreach (Task03Entities.Entites item in newViewStateList)
{
}
I suspect you want something like:
我怀疑你想要这样的东西：
List<Task03Entities.Entites> newViewStateList = new List<Task03Entities.Entites>();
foreach (Task03Entities.Entites item in newViewStateList)
{
//code...
}
回答by Tigran
Considering message your type Task03Entities.Entitesis not a collection and/or not enumerable type. So in order to be able to use foreachon it, you have to make it such.
考虑到 message 您的类型 Task03Entities.Entites不是集合和/或不可枚举类型。所以为了能够使用foreach它，你必须让它这样。
For example can have a look on: How to make a Visual C# class usable in a foreach statement
例如，可以查看：如何使 Visual C# 类在 foreach 语句中可用
回答by Tamizh venthan
just add @model IEnumerable int the first line instead of your regular @model line
只需在第一行添加 @model IEnumerable int 而不是常规的 @model 行
