C＃foreach将list属性设置为使用list在一行中循环索引。

Question

int loopIndex = 0;
foreach (var item in dataList)
{
    item.ChannelId = loopIndex;
    loopIndex++;
}

I am looking for an alternate of above code in one line. Something like- dataList.ForEach(x=>x.ChannelId=...)

Suggestions please.

Answer 1

如果您使用NuGet Microsoft的“ System.Interactive”扩展，则可以执行以下操作：

dataList.ForEach((item, index) => item.ChannelId = index);

Answer 2

Here is a Linq appraoch in one line without the requiremet to install another library

dataList = dataList.Select((x, i) => { x.ChannelId = i; return x; }).ToList();

Code: https://dotnetfiddle.net/SCEbyV

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another appraoch - the classy for loop way in one line

for (int i = 0; i < dataList.Count; i++) dataList[i].ChannelId = i;

Answer 3

尝试这个

dataList.ForEach(x => x.ChannelId = loopIndex++);

Answer 4

尝试这个

dataList= dataList.Select(x=>x.ChannelId=loopIndex++).ToList();