Is it safe to use a DirectoryInfo object as a key in a dictionary?

Question

I use a dictionary using objects such as DirectoryInfo and FileInfo as keys. Is it safe to use them this way? How can I make sure that the type of an object can be safely used in this way?

Answer 1

In general, the only way to know exactly how this will behave is to check the reference source. You can check the documentation to see if it is being implemented IEquatable<T>(in this case you will also get the “expected” behavior).

Equals GetHashCode, . , , , System.Object.

DirectoryInfo , , , , , , . FullName , aa string .

Answer 2

, , DirectoryInfo, , -.

, !

new System.IO.DirectoryInfo(@"C:\").GetHashCode(); // 25422474
new System.IO.DirectoryInfo(@"C:\").GetHashCode(); // 48007696

- . , . .

, GetHashCode .

Answer 3

, , "" . . , , , . , , .