[英]LINQ Return DISTINCT Values
我有一個LINQ to Entities查詢,我只想返回TagID和TagName的唯一值。
碼:
var tags = (from t in _dbContext.TaskRecordDetails.ToList()
join tag in _dbContext.Tags on t.TagName equals tag.TagName
where t.Period == period
select new TagDTO()
{
TagID = tag.TagID,
TagName = tag.TagName
});
return tags.Distinct<TagDTO>();
但是,重復的行仍將返回,如下所示。 如何確保僅返回唯一行?
[
{
"TagID": 1,
"TagName": "Level 1",
"TagDescription": null,
"IsActive": false
},
{
"TagID": 2,
"TagName": "Level 3",
"TagDescription": null,
"IsActive": false
},
{
"TagID": 3,
"TagName": "Level 5",
"TagDescription": null,
"IsActive": false
},
{
"TagID": 1,
"TagName": "Level 1",
"TagDescription": null,
"IsActive": false
},
{
"TagID": 2,
"TagName": "Level 3",
"TagDescription": null,
"IsActive": false
}
]
根據您的最新評論,這里是一個解決方案:
var tags = (from t in _dbContext.TaskRecordDetails
join tag in _dbContext.Tags on t.TagName equals tag.TagName
where t.Period == period
select tag).Distinct().ToList();
return tags.select(x => new TagDTO
{
TagID = x.TagID,
TagName = x.TagName
});
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