比较两个List＆LT;＆GT; [英] comparing two List<>

问题描述

我有上有一个复选框GridView控件

当我打的保存按钮我能找到已检查的复选框，我能够做到这一点到目前为止好，但问题是：

如果让用户尝试取消选中checkedbox所以如何将我跟踪更改，并保存到已检查了分贝说。 anyhelp？..所以在这方面我已经创建了两个名单对比...希望我意义在这里。

我想比较两个列表，如果任何更改，然后保存别的....做些什么...

 ＆LT; ASP：的TemplateField的HeaderText =选择＆GT; ＆LT;＆ItemTemplate中GT;
      ＆LT; ASP：复选框ID =chkSelected=服务器选中=假＆GT;＆LT; / ASP：复选框＆GT;
＆LT; / ItemTemplate中＆GT; ＆LT; / ASP：的TemplateField＆GT;
清单＆LT;员工＆GT; listFromDB =新的List＆LT;员工＆GT;（）;
listFromDB = EmployeeListFromDB; //加载列表清单＆LT;员工＆GT; selectedEmployee =新的List＆LT;员工＆GT;（）;
selectedEmployee = MySelectedEmployee //加载列表// Employee对象如下：
ID
名称
 

这里是我被困，这里是我在做什么...

 的foreach（在MySelectedEmployee员工项）
{
    布尔_flag = FALSE;
    _flag = EmployeeService.SaveEmployee（item.Id，item.Name）;
}
 

解决方案

这里是你会怎么做：

 列表＆LT;员工＆GT;找到= EmployeeListFromDB.FindAll（A =＆GT;！selectedEmployee.Exists（B = GT; a.Id == b.Id））;
 

完蛋了...

i have gridview control with a checkbox on it

When i hit on save button i able to find the checkbox which have been checked and i able to do it so far so good but the problem is:

let say if the user tries to uncheck the checkedbox so how would i track the changes and save it into the db that has been checked. anyhelp?.. so in that regards i have created two list for comparision... hope i make sense here.

i want to compare the two list and if any changes then save else ....do something...

<asp:TemplateField HeaderText="Select">  <ItemTemplate>  
      <asp:CheckBox ID="chkSelected" runat="server" Checked="false"></asp:CheckBox>   
</ItemTemplate>  </asp:TemplateField>     


List<Employee> listFromDB = new List<Employee>();
listFromDB = EmployeeListFromDB ; //loads the list

List<Employee> selectedEmployee = new List<Employee>();
selectedEmployee = MySelectedEmployee //loads the list

//Employee object looks like this:
id
name

here is what i got stuck and here is what i am doing...

foreach (Employee item in MySelectedEmployee )
{
    bool _flag = false;
    _flag = EmployeeService.SaveEmployee(item.Id, item.Name);
}

解决方案

here is how you would do:

List<Employee> found = EmployeeListFromDB.FindAll(a=>!selectedEmployee.Exists(b=>a.Id == b.Id));

thats it...

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