C＃ - 如何創建一個KeyValuePair與兩個foreach循環的結果？

Question

所以下面是我目前擁有的代碼（這是行不通的，因爲最後一塊看到數組的定義，它是顯示我想要做的）

IEnumerable<string> sponsorshipQuery1 = 
    from runner1 in venueQuery6.Descendants("Runner") 
    where (int)runner1.Element("Sponsorship") > 0 
    orderby (int)runner1.Element("Sponsorship") descending 
    select runner1.Element("Firstname").Value; 

IEnumerable<string> sponsorshipQuery2 = 
    from runner1 in venueQuery6.Descendants("Runner") 
    where (int)runner1.Element("Sponsorship") > 0 
    orderby (int)runner1.Element("Sponsorship") descending 
    select runner1.Element("Sponsorship").Value; 

string[] nameArray; 
string[] moneyArray; 

foreach (string name in sponsorshipQuery1) 
{ 
    nameArray = sponsorshipQuery1 
    .OfType<object>() 
    .Select(o => o.ToString()).ToArray(); 
} 

foreach (string money in sponsorshipQuery2) 
{ 
    moneyArray = sponsorshipQuery2 
    .OfType<object>() 
    .Select(o => o.ToString()) 
    .ToArray(); 
} 

Console.WriteLine("All sponsorship money raised in descending order:"); 
for (int i = 0; i < nameArray.Length; i++) 
{ 
    Console.WriteLine(nameArray[i] + " has raised £" + moneyArray[i]); 
} 

理想情況下，我希望能夠在底部執行for循環。我想在替換兩個foreach循環，並使他們KeyValuePairs但我不知道該怎麼做。

我也是新來使用LINQ查詢，所以我之所以有查詢語法的混合物=>語法是因爲我被教導的查詢語法，但我也想代碼中，我就發現互聯網。

Answer 1

這似乎從你的示例代碼，你可以只得到一個查詢這兩個值，並將其保存在一個匿名類型：

var results = from runner1 in venueQuery6.Descendants("Runner") 
        where (int)runner1.Element("Sponsorship") > 0 
        orderby (int)runner1.Element("Sponsorship") descending 
        select new { 
        Name = runner1.Element("Firstname").Value, 
        Amount = runner1.Element("Sponsorship").Value 
        }; 

然後你可以遍歷這些結果：

foreach (var result in results) 
{ 
    Console.WriteLine(result.Name + " has raised £" + result.Amount); 
} 

Answer 2

串聯迭代兩個序列的最高級別的方法是Zip。爲了得到KeyValuePair的I會使用

sponsorshipQuery1.Zip(sponsorshipQuery2, (k, v) => new KeyValuePair<string, string>(k, v)) 

雖然我可能不會使用KeyValuePair所有，但更具體的我的任務或匿名類型的東西，除非我真正關心它作爲一個鍵值對。

遍歷你已經涵蓋兩個數組。要在做雙不了的（必須）索引一個需要環路的至少一個分解爲組成它的MoveNext()和Current

using (var en1 = sponsorshipQuery1.GetEnumerator()) 
{ 
    foreach(var item2 in sponsorshipQuery2) 
    { 
    if (!en1.MoveNext()) 
    { 
     break; 
    } 
    var item1 = en.Current; 
    // Do something with the two items here. E.g. 
    } 
} 

在你的具體的例子，雖然因爲你有一個共同來源：

from runner1 in venueQuery6.Descendants("Runner") 
    where (int)runner1.Element("Sponsorship") > 0 
    orderby (int)runner1.Element("Sponsorship") descending 

我只是select new KeyValuePair<string, string>(runner1.Element("Firstname").Value, runner.Element("Sponsorship").Value)開始。