c# Double.TryParse("1,1,1", out value) returns true, value = 111 huh?

in the immed window:

?Double.Parse("4,67,34,34,46,34,235,346")
4673434463开发者_开发知识库4235344.0

How to I stop this and only allow 4.56 4,455,455.33, 1.23E5 to succeed?

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There is an overload Double.Parse(String, NumberStyles) that allow you to specify what is allowed. See this msdn page for more information.

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TryParse accepts culture-specific group separators anywhere in the input string. The accepted format is

[ws][sign][integral-digits,]integral-digits[.[fractional-digits]][e[sign]exponential-digits][ws]

Where , is the culture-specific group separator and . is the decimal point.

With my current locale setting the following

double d;
Console.WriteLine(double.TryParse("1.1.1,2", out d)); // one decimal point, two group separators
Console.WriteLine(d);

evaluates to true and 111,2 while

double d;
Console.WriteLine(double.TryParse("1.1.1,2,2", out d)); // two decimal points
Console.WriteLine(d);

evaluates to false and 0.