how to declare var type as globally

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hi, i want to use var type of declarations as globally, i used like this, but it is not accepting, how can i declare this type of variable globally. or do we have another declarations to store linq query result. simply

var testdata;
int count;//count value is coming through method parameters as 1 or 2 or 3, here i have declared as sample
if(count==1)
{
testdata=(from s in spe.contacts select s).orderbyDesending(x=>x.id).take(1);
}

C#

else if(count==2)
{
testdata=(from s in spe.contacts select s).orderbyDesending(x=>x.id).take(2);
}

C#

if(count==3)
{
testdata=(from s in spe.contacts select s).orderbyDesending(x=>x.id).take(3);
}

but it is not accepting, please help me to solve this.

Posted 24-Sep-14 3:39am

pavan_ kumar

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Thomas Daniels · Accepted Answer · 2014-09-24T04:09:00

In this specific case, you can just use count as argument for Take:

C#

var testdata = (from s in spe.contacts select s).OrderByDesending(x=>x.id).Take(count);

In other cases, if you do not return an anonymous type, you can use IQueryable<Type>, where Type is the type of the elements you return.

C#

IQueryable<Type> testdata = null;
// your if statements here

// after the if statements:
if (testdata != null)
{
    // continue
}
else
{
    // testdata is null, none of the code in the previous if statements has been executed
}

Sergey Alexandrovich Kryukov · Accepted Answer · 2014-09-24T06:49:00

There is nothing to "define globally", or anyhow. There is no such thing as "var type".

When you declare a variable using var, it is strictly equivalent to writing on of the concrete fully-defined types. You just assume that the compiler can infer this type from the context of your code and "automatically substitute" this type instead of var, as if you did it with your own hands. If unambiguous inference is not possible, the compiler will give you a syntax error with proper explanation of ambiguity.

Please see:
http://en.wikipedia.org/wiki/Type_inference[^],
http://msdn.microsoft.com/en-us/library/bb384061.aspx[^].

—SA

how to declare var type as globally

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