排序由2個屬性

Question

我試圖理清這樣的對象列表的機型列表：

products.Sort((a, b) => 
{ 
    var x = string.CompareOrdinal(a.SelectToken("model").ToString(), b.SelectToken("model").ToString()); 
    var z = string.CompareOrdinal(b.SelectToken("colour").ToString(), colour); 
    return x > 0 ? z : x; 
}); 

，然後我通過反向列表要循環，所以我可以刪除重複：

// Loop through products in reverse 
for (var i = products.Count() - 1; i >= 0; i--) 
{ 

    // Get our product 
    var product = products[i]; 

    // Get our product colour 
    var productColour = product.SelectToken("colour").ToString(); 

    // If our colour is black 
    if (colour == "Black") 
    { 

     // If the product colour is not black, remove the duplicate product 
     if (!productColour.Equals(colour)) 
      products.RemoveAt(i); 

    } 
    else 
    { 

     // Get our product model 
     var productModel = product.SelectToken("model").ToString(); 

     // If we are the same model but a different colour, remove the duplicate 
     if (productModel.Equals(model) && !productColour.Equals(colour)) 
      products.RemoveAt(i); 

     // Update our variable 
     model = productModel; 
    } 
} 

但它並不僅僅如此簡單。 顏色變量默認爲「黑色」，但可以設置爲任何顏色。所以，我想排序模型第一，然後由顏色，但我想要它，以便它分類顏色這樣。如果顏色是「粉紅」的名單應該是這樣的：

[{ 
    colour: 'Any' 
},{ 
    colour: 'Any' 
},{ 
    colour: 'Any' 
},{ 
    colour: 'Black' 
},{ 
    colour: 'Black' 
},{ 
    colour: 'Pink' 
}] 

所以基本上，如果選擇的顏色不是黑色的，它應該是在sort的底部，隨後直接黑（所有其他顏色在這兩個之前）。如果選擇的顏色是黑色，則黑色應該位於列表的底部。 有人可以幫我解決這個問題嗎？

只是爲了信息，這是一個項目的一個例子進行排序：

{ 
    "id": 3797, 
    "title": "Canon EOS 100D Digital SLR Camera with 18-55 IS STM Lens, HD 1080p, 18MP, 3\" LCD Touch Screen", 
    "shortTitle": "Canon EOS 100D Black", 
    "brand": "Canon", 
    "model": "EOS 100D", 
    "colour": "Black", 
    "gtin": "8714574602721", 
    "image": "http://piiick.blob.core.windows.net/images/Canon-EOS-100D-18-55-Black-8714574602721.png", 
    "type": "Digital SLR", 
    "lensFocalLength": "18-55", 
    "lensType": "IS STM", 
    "lensMount": "EF/EF-S", 
    "maxAperture": "999", 
    "connectivity": "", 
    "shootingModes": "Scene Intelligent Auto (Stills and Movie), No Flash, Creative Auto, Portrait, Landscape, Close-up, Sports, SCN(Kids, Food, Candlelight, Night Portrait, Handheld Night Scene, HDR Backlight Control), Program AE , Shutter priority AE, Aperture priority AE, Manual (Stills and Movie)", 
    "weight": 410.0, 
    "width": 116.8, 
    "height": 90.7, 
    "depth": 69.4, 
    "digitalZoom": "N/A", 
    "opticalZoom": "N/A", 
    "waterproof": false, 
    "maxVideoResolution": "1920 x 1080", 
    "sensorType": "CMOS", 
    "sensorSize": "22.3 x 14.9 mm", 
    "continuousShootingSpeed": "4", 
    "iso": "1600", 
    "style": "traditional", 
    "designer": "", 
    "dateAnnounced": "10/06/2008", 
    "focusPoints": 7 
} 

，一個產品可能不具有黑色的顏色或所選擇的顏色，但我這是完全有可能的不想從我的列表中刪除它（只是重複的模型）。

Answer 1

您的排序算法應該改變，以適應你想要的。 我的理解是，您按型號排序，然後按相同型號中的顏色排序，但selectedColor應該位於最下方。但是，黑色應該在所選顏色的正上方。我認爲刪除重複內容不應該是個問題。

必要時交換1和-1。

products.Sort((a, b) => 
{ 
    var x = string.CompareOrdinal(a.SelectToken("model").ToString(); 
If (x!=0) return x; 


if (a.color == selectedColor){ 
    return 1 
} 

if (b.color == selectedColor){ 
    return -1 
} 

if (a.color == "black") { 
    return 1 
} 

if (b.color == "black") { 
    return -1 
} 
    return string.CompareOrdinal(b.SelectToken("colour").ToString(), colour); 
}); 

Answer 2

如果您的意圖是刪除重複，爲什麼不只是使用groupby？

string str = @"[{'model':'aaa', 'colour':'red'} 
      ,{'model':'aaa', 'colour':'red'} 
      ,{'model':'aaa', 'colour':'green'} 
      ,{'model':'bbb', 'colour':'red'}]"; 

JArray allProducts = JArray.Parse(str); 

//Get the first product of each group 
var uniq = allProducts 
    .GroupBy(x => new { model = x["model"], colour = x["colour"] }) 
    .Select(x => x.First()) 
    .ToList(); 

或通過選擇的顏色來過濾，添加where子句

string colour = "red"; 

var uniq = allProducts 
    .GroupBy(x => new { model = x["model"], colour = x["colour"] }) 
    .Select(x => x.First()) 
    .Where(x => x["colour"].Value<string>() == colour) 
    .ToList();