Encoding type as a var

if (ra开发者_JAVA技巧dioButton1.Checked) {
    var Enc = Encoding.Unicode;
}

var text = File.ReadAllText(filePath, (Enc);

It doesn't work, any way to make the encoding type a var so I can later p

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The problem isn't using var - it's that you've declared the variable inside a block, and then you're trying to use it outside the block.

Here's an alternative:

var encoding = Encoding.UTF8; // Default to UTF-8

if (useUtf16RadioButton.Checked)
{
    encoding = Encoding.Unicode;
}
var text = File.ReadAllText(filePath, encoding);

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The problem is that you must assign a value when you declare a variable with var so the type can be inferred (also you did specify Enc only within the scope of the if condition so it couldn't be used afterwards):

var Enc = Encoding.UTF8; //default
if (radioButton1.Checked) {
    Enc = Encoding.Unicode;
}

var text = File.ReadAllText(filePath, Enc);