Information Technology Reference
In-Depth Information
Another Form of the using Statement
Another form of the
using
statement is the following:
Keyword
Resource
Uses resource
↓
↓
↓
using (
Expression
)
EmbeddedStatement
In this form, the resource is declared before the
using
statement.
TextWriter tw = File.CreateText("Lincoln.txt"); // Resource declared
using ( tw ) // using statement
tw.WriteLine("Four score and seven years ago, ...");
Although this form still ensures that the
Dispose
method will always be called after you use
the resource, it does not protect you from attempting to use the resource after the
using
state-
ment has deallocated it. It therefore gives less protection and is discouraged. This form is
illustrated in Figure 9-12.
Figure 9-12.
Resource declaration before the using statement
