class Package { public string Company { get; set; } public double Weight { get; set; } public long TrackingNumber { get; set; } } public static void ILookupExample() { // Create a list of Packages to put into an ILookup data structure. List<Package> packages = new List<Package> { new Package { Company = "Coho Vineyard", Weight = 25.2, TrackingNumber = 89453312L }, new Package { Company = "Lucerne Publishing", Weight = 18.7, TrackingNumber = 89112755L }, new Package { Company = "Wingtip Toys", Weight = 6.0, TrackingNumber = 299456122L }, new Package { Company = "Contoso Pharmaceuticals", Weight = 9.3, TrackingNumber = 670053128L }, new Package { Company = "Wide World Importers", Weight = 33.8, TrackingNumber = 4665518773L } }; // Create a Lookup to organize the packages. Use the first character of Company as the key value. // Select Company appended to TrackingNumber for each element value in the ILookup object. ILookup<char, string> packageLookup = packages.ToLookup( p => p.Company[0], p => p.Company + " " + p.TrackingNumber ); // Iterate through each value in the ILookup and output the contents. foreach (var packageGroup in packageLookup) { // Print the key value. Console.WriteLine(packageGroup.Key); // Iterate through each value in the collection. foreach (string str in packageGroup) Console.WriteLine(" {0}", str); } // This code produces the following output: // // C // Coho Vineyard 89453312 // Contoso Pharmaceuticals 670053128 // L // Lucerne Publishing 89112755 // W // Wingtip Toys 299456122 // Wide World Importers 4665518773 }
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