如何检查列表类是否包含该对象 [英] How to check that list class contains the object or not

问题描述

如果列表中尚未包含该类，我需要将类添加到列表中



我正在尝试这样的事情，但我不明白如何继续进行

Hi,

I need to add class to the list if the list does not already contains the class

I am trying something like this, but I do not understand how tto proceed further

numofBuses = "3";
                select1 = "Red";
                select2 = "Yellow";
                select3 = "Green";
                select4 = "";


                GWmsgDetailsList = ResponseTimeofMsgs(numofBuses, select1, select2, select3, select4);
                
                foreach (var GatewayMessageDetails in GWmsgDetailsList)
                {


                    
                    GWmessageDetailsList.Add(GatewayMessageDetails);

                }
                
                select1 = "Red";
                select2 = "Green";
                select3 = "Yellow";
                select4 = "";

                GWmsgDetailsList = ResponseTimeofMsgs(numofBuses, select1, select2, select3, select4);
                foreach (var GatewayMessageDetails in GWmsgDetailsList)
                {
                     //if(GWmessageDetailsList.MsgId.Contains
                    GWmessageDetailsList.Add(GatewayMessageDetails);

                }

首次使用foreach循环是好的

但是当谈到第二次时，我需要检查列表类是否已经包含相同的MsgId，然后我需要进行处理。



任何人都可以帮我写这个代码



提前谢谢

The foreach loop for first time is ok
But when it comes to second time , I need to check whether it the list class already contains the same MsgId or not, then I need to procedd.

Can anyone help me in writing the code for this

Thanks in advance

推荐答案

假设您正在查看某个项目是否存在相同的MsgId，这应该有效：

Assuming you are looking to see if an item exists with the same MsgId, this should work:

foreach (var GatewayMessageDetails in GWmsgDetailsList)
{
       if(!GWmessageDetailsList.Any(g=> g.MsgId == GatewayMessageDetails.MsgId)
           GWmessageDetailsList.Add(GatewayMessageDetails);

}

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