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我在做一些可能很简单的事情时遇到问题。

我的 LINQ 查询返回 10 个对象的结果集。

就像是：

Name: Bill, Action: aaa, Id: 832758
Name: Tony, Action: aaa, Id: 82fd58
Name: Bill, Action: bbb, Id: 532758
Name: Tony, Action: bbb, Id: 42fd58

我需要做的是对这些进行分组，以便只有 2 行，即每个名称一个，但将带有“Action: bbb”的行移到不同的列中。所以输出将是：

Name: Bill, Action: aaa, Action_2: bbb, Id: 832758, Id_2: 532758
Name: Tony, Action: aaa, Action_2: bbb, Id: 82fd58, Id_2: 42fd58

谁能向我解释我该怎么做？

干杯

4

2 回答 2

1

我认为没有真正简单的方法可以做到这一点。不过，我已经确定了这一点，这可能会让你开始：

var myData = new []
{
    new { Name = "Bill", Action="aaa", Id = "832758" },
    new { Name = "Tony", Action="aaa", Id = "82fd58" },
    new { Name = "Bill", Action="bbb", Id = "532758" },
    new { Name = "Tony", Action="bbb", Id = "42fd58" }
};

// group all the Names together
var result = from m in myData
group m by m.Name into names
orderby names.Key
select names;

// go through each Name group and create the output string to store in sbLines
var sbLines = new StringBuilder();
foreach (var name in result)
{
    var sb = new StringBuilder();
    sb.AppendFormat("Name: {0}, ", name.Key);

    int count = 1;
    foreach (var item in name)
    {
        if(count > 1)
            sb.AppendFormat("Action_{0}: {1}, ", count, item.Action);
        else
            sb.AppendFormat("Action: {0}, ", item.Action);
        count++;
    }

    count = 1;
    foreach (var item in name)
    {
        if(count > 1)
            sb.AppendFormat("Id_{0}: {1}, ", count, item.Id);
        else
            sb.AppendFormat("Id: {0}, ", item.Id);
        count++;
    }

    sbLines.Append(sb.ToString().Trim(new char[] { ' ',',' }));
    sbLines.Append(Environment.NewLine);
}

Console.WriteLine(sbLines.ToString());

在这里运行它：http: //ideone.com/8UTxr

于 2012-05-02T19:31:03.380 回答
1 
var myData = new [] 
{ 
    new { Name = "Bill", Action="aaa", Id = "832758" }, 
    new { Name = "Tony", Action="aaa", Id = "82fd58" }, 
    new { Name = "Bill", Action="bbb", Id = "532758" }, 
    new { Name = "Tony", Action="bbb", Id = "42fd58" } 
}; 

var result = myData
    .GroupBy(x=>x.Name)
    .Select(g=>new
    {
        Name = g.Key,
        Action = g.First().Action,
        Action_2 = g.Last().Action,
        Id = g.First().Id,
        Id_2 = g.Last().Id
    });

上面的查询假设每个名称只有两行；如果每个名称有多行，则可以使用而不是取第二个Action/值Id.Skip(1).Take(1).Last()

于 2012-05-03T09:54:47.070 回答