[Solved] Switch vs dictionary with double keys

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Your business logic is a bit unclear, but in regards to the Dictionary object initialization/performance issue, the solution below may serve as a valid alternative. Pertinent to your use-case, you can declare Dictionary<double, int> as shown in the following sample C# code snippet:

public static  Dictionary<double, int> SampleDictionary =new Dictionary<double, int> 
{ 
    { 3.1, 3},
    { 3.14, 3},
    { 3.1415, 3},
    { 2.72, 2},
    { 2.728, 2}
};

It will be very fast and rather straightforward. Hope this may help.

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solved Switch vs dictionary with double keys