Flag attribute in .net

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.NET3.5

Hi,

I have a project of Patient information system.In this project I am using flag attribute but after run my project I am getting the error "the name flag does not exist in current context".
How can i clear this?
plz help me.

Posted 20-Apr-11 19:45pm

sridharan28

Updated 20-Apr-11 19:51pm

RaviRanjanKr

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-04-20T19:57:00

This is System.Flags.

Optionally, use

C#

using System;

or

C#

using Flags = System.Flags;

In the above cases you could omit "System" from "System.Flags".

Remember, this attribute only affect string presentation of the value of your enumeration type, showing bit set properly, for example "DeclaredOnly, Static"; without this attribute it would be "10".

Also, "OptionalParamBinding = 262144" is pretty bad. Use hexadecimal notation for readability, or, better yet, a binary shift:

C#

[Flags]
enum NumericSamples {
   None = 0,
   First = 1 << 0,
   Second = 1 << 1,
   Third = 1 << 2,
}

For more useful hints and techniques, see my articles:
Enumeration Types do not Enumerate! Working around .NET and Language Limitations[^],
Human-readable Enumeration Meta-data[^],
Enumeration-based Command Line Utility[^], especially the first one.

Good luck,

—SA

GlobX · Answer 2 · 2011-04-20T19:50:00

Sridharan, some more information and source code would help!

From your question I'm going to blindly guess you are using 'flag' instead of 'Flags', see below:

C#

[Flags] // System.Flags or System.FlagsAttribute will also work.
public enum BindingFlags
{
    Default = 0,
    IgnoreCase = 1,
    DeclaredOnly = 2,
    Instance = 4,
    Static = 8,
    Public = 16,
    NonPublic = 32,
    FlattenHierarchy = 64,
    InvokeMethod = 256,
    CreateInstance = 512,
    GetField = 1024,
    SetField = 2048,
    GetProperty = 4096,
    SetProperty = 8192,
    PutDispProperty = 16384,
    PutRefDispProperty = 32768,
    ExactBinding = 65536,
    SuppressChangeType = 131072,
    OptionalParamBinding = 262144,
    IgnoreReturn = 16777216,
}

I'm going to assume you know how flags work and why you would/wouldn't use them :)

Flag attribute in .net

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