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Published on 2010-03-22T07:16:33Z
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2010/03/22
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In C# code I have a variable Guid? name.But,how to initialize this parameter to null,since I cannot assign null for a guid type
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How can we implement a nullable type in C# if we didn't have this feature in C#?
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I get the following compilation error with the following source code:
Compilation Error:
Type of conditional expression cannot be determined because there is no implicit conversion between '' and 'MyEnum'
Source Code
public enum MyEnum
{
Value1, Value2, Value3
}
public class MyClass
{
…
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Hi,
I have a table called Users in my database. Let's assume that User has only 3 properties
int ID;
string? Name;
string Login;
If user doesn't specify his name then Login is displayed. Otherwise Name is displayed. I wan't to get list of all users sorted by what is displayed. So if user specified…
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I see everywhere constructions like:
int? myVar = null;
string test = myVar.HasValue ? myVar.Value.ToString() : string.Empty;
Why not use simply:
string test = myVar.ToString();
Isn't that exactly the same ?
At least Reflector says that:
public override string ToString()
{
if (!this…
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I want to generate this SQL statement in LINQ:
select * from Foo where Value in ( 1, 2, 3 )
The tricky bit seems to be that Value is a column that allows nulls.
The equivalent LINQ code would seem to be:
IEnumerable<Foo> foos = MyDataContext.Foos;
IEnumerable<int> values = GetMyValues();
var…
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