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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