C# The call is ambiguous between the following methods or properties: 'System.Math.Round(double, int)' and 'System.Math.Round(decimal, int)

问题

My code won't compile due to the error below:

The call is ambiguous between the following methods or properties: 'System.Math.Round(double, int)' and 'System.Math.Round(decimal, int)

My code is

Math.Round(new FileInfo(strFilePath).Length / 1024, 1)

How can I fix this?

Thanks

回答1:

The problem is that you make an integer division (results also in an int) and a int can be implicitly converted to both double and decimal. Therefore, you need to make sure the expression results in one of those; double is probably what you want.

Math.Round(new FileInfo(strFilePath).Length / 1024.0, 1)

回答2:

Math.Round(new FileInfo(strFilePath).Length / 1024d, 1)

回答3:

Math.Round((double) (new FileInfo(strFilePath).Length / 1024), 1)

来源：https://stackoverflow.com/questions/771825/c-sharp-the-call-is-ambiguous-between-the-following-methods-or-properties-syst