How to convert a GUID to a string in C#?

问题

I'm new to C#.

I know in vb.net, i can do this:

Dim guid as string = System.Guid.NewGuid.ToString

In C#, I'm trying to do

String guid = System.Guid.NewGuid().ToString;

but i get an "Cannot convert method group 'ToString' to non-delegate type 'string'. Did you intend to invoke the method?" error.

回答1:

You're missing the () after ToString that marks it as a function call vs. a function reference (the kind you pass to delegates), which incidentally is why c# has no AddressOf operator, it's implied by how you type it.

Try this:

string guid = System.Guid.NewGuid().ToString();

回答2:

According to MSDN the method Guid.ToString(string format) returns a string representation of the value of this Guid instance, according to the provided format specifier.

Examples:

guidVal.ToString() or guidVal.ToString("D") returns 32 digits separated by hyphens: 00000000-0000-0000-0000-000000000000
guidVal.ToString("N") returns 32 digits:00000000000000000000000000000000
guidVal.ToString("B") returns 32 digits separated by hyphens, enclosed in braces:{00000000-0000-0000-0000-000000000000}

回答3:

In Visual Basic, you can call a parameterless method without the braces (()). In C#, they're mandatory. So you should write:

String guid = System.Guid.NewGuid().ToString();

Without the braces, you're assigning the method itself (instead of its result) to the variable guid, and obviously the method cannot be converted to a String, hence the error.

回答4:

String guid = System.Guid.NewGuid().ToString();

Otherwise it's a delegate.

回答5:

Here are examples of output from each of the format specifiers:

N: cd26ccf675d64521884f1693c62ed303
D: cd26ccf6-75d6-4521-884f-1693c62ed303
B: {cd26ccf6-75d6-4521-884f-1693c62ed303}
P: (cd26ccf6-75d6-4521-884f-1693c62ed303)
X: {0xcd26ccf6,0x75d6,0x4521,{0x88,0x4f,0x16,0x93,0xc6,0x2e,0xd3,0x03}}

The default is D.

Run this yourself.

回答6:

you are missing () on the end of ToString.

回答7:

You need

String guid = System.Guid.NewGuid().ToString();

回答8:

Did you write

String guid = System.Guid.NewGuid().ToString;

String guid = System.Guid.NewGuid().ToString();

notice the paranthesis

回答9:

Guid guidId = Guid.Parse("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx");
string guidValue = guidId.ToString("D"); //return with hyphens

来源：https://stackoverflow.com/questions/1700361/how-to-convert-a-guid-to-a-string-in-c

标签

string

guid