[英]Update a variable in list from another list using c# linq
I want to copy data from one list to another list.我想将数据从一个列表复制到另一个列表。 While copying to the new list, i want to assign new values also.
在复制到新列表时,我也想分配新值。 Can someone please assist quickly.
有人可以请尽快提供帮助。 I want to achieve something like below,
我想实现以下目标,
public HashSet<string> MobileNumber { get; set; }
var contactViewData = MobileNumber.Select(p => p).SelectMany(o => o.SplitFromCsv()).Select(x => new ContactViewMap()
{
ContactId = Guid.NewGuid().ToString(),
NewMobileNumber = x,
OldMobileNumber = p
}).ToList();
public class ContactViewMap
{
public string ContactId { get; set; }
public string NewMobileNumber { get; set; }
public string OldMobileNumber { get; set; }
}
public static IEnumerable<string> SplitFromCsv(this string csv)
=> csv.Split(',', StringSplitOptions.None);
Input:
{
"MobileNumber": [
"+9112352",
"+9112353"
]
}
Select(p => p)
Just returns the same item again. Select(p => p)
只是再次返回相同的项目。
I think instead of this: Select(p => p).SelectMany(o => o.SplitFromCsv())
我认为不是这样:
Select(p => p).SelectMany(o => o.SplitFromCsv())
You need this: Select(p => (p, csv: o.SplitFromCsv()) )
你需要这个:
Select(p => (p, csv: o.SplitFromCsv()) )
Now you can use that tuple in the final Select
:现在您可以在最终的
Select
中使用该元组:
.Select(x => new ContactViewMap()
{
ContactId = Guid.NewGuid().ToString(),
NewMobileNumber = x.csv,
OldMobileNumber = x.p
})
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