Add keys/values to Dictionary at declaration

Very easy today, I think. In C#, its:

Dictionary<String, String> dict = new Dictionary<string, string>() { { "", "" } };

But in vb, the following doesn't work.

Public dict As Dictionary(Of String, String) = New Dictionary(Of String, String) (("",""))

I'm pretty sure there's a way to add them at declaration, but I'm not sure how. And yes, I want to add them at declaration, not any other time. :) So hopefully it's possible. Thanks everyone.

I've also tried:

Public dict As Dictionary(Of String, String) = New Dictionary(Of String, String) ({"",""})

And...

Public dict As Dictionary(Of String, String) = New Dictionary(Of String, String) {("","")}

And...

Public dict As Dictionary(Of String, String) = New Dictionary(Of String, String) {{"",""}}
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There's no constructor to take a KeyValuePair for a dictionary.

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最佳答案

This is possible in VB.NET 10:

Dim dict = New Dictionary(Of Integer, String) From \{\{ 1, "Test1" }, { 2, "Test1" }}

Unfortunately IIRC VS 2008 uses VB.NET 9 compiler which doesn't support this syntax.

And for those that might be interested here's what happens behind the scenes (C#):

Dictionary<int, string> VB$t_ref$S0 = new Dictionary<int, string>();
VB$t_ref$S0.Add(1, "Test1");
VB$t_ref$S0.Add(2, "Test1");
Dictionary<int, string> dict = VB$t_ref$S0;
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It is much the same, use the From keyword:

    Dim d As New Dictionary(Of String, String) From \{\{"", ""}}

However, this requires version 10 of the language, available in VS2010.

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Here's a cool translation: You can also have a Generic Dictionary of strings and string array.

C#:

private static readonly Dictionary<string, string[]> dics = new Dictionary<string, string[]>
{
{"sizes", new string[]  {"small", "medium", "large"}},
{"colors", new string[]  {"black", "red", "brown"}},
{"shapes", new string[]  {"circle", "square"}}
};

VB:

Private Shared ReadOnly dics As New Dictionary(Of String, String()) From {
{"sizes", New String() {"small", "medium", "large"}},
{"colors", New String() {"black", "red", "brown"}},
{"shapes", New String() {"circle", "square"}}}

Cool haa :)


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