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Custom FxCop Rule - Do not use Wildcards in Assembly Version Number

Here is an FxCop rule which prevents you from using wildcards in an assembly's version number. A better programming practice it to explicitly set the version number in the assemblyinfo file.

While there is no certain way to know that a wildcard was used, we can infer it by looking at the length of the individual components of the version number. If any of them are five characters longer, it is a safe bet that they were set by .NET since most programmers would typically use a shorter number.

C# code for custom FxCop rule:

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Cci;
using Microsoft.FxCop.Sdk;
using Microsoft.FxCop.Sdk.Introspection;

public class DoNotUseWildcardsInVersion : BaseMigrationIntrospectionRule
{
    public DoNotUseWildcardsInVersion() : base("DoNotUseWildcardsInVersion")
    {
    }
    public override ProblemCollection Check(Module module)
    {
        AssemblyNode a = module.ContainingAssembly;

        if ((a == null) || (a.Version == null))
            return base.Check(module);

        string major = a.Version.Major.ToString();
        string minor = a.Version.Minor.ToString();
        string build = a.Version.Build.ToString();
        string revision = a.Version.Revision.ToString();

        if (major.Trim().Length.Equals(5))
        {
            base.Problems.Add(new Problem(GetResolution(module.Name), module));
        }

        if (minor.Trim().Length.Equals(5))
        {
            base.Problems.Add(new Problem(GetResolution(module.Name), module));
        }
        if (build.Trim().Length.Equals(5))
        {
            base.Problems.Add(new Problem(GetResolution(module.Name), module));
        }

        if (revision.Trim().Length.Equals(5))
        {
            base.Problems.Add(new Problem(GetResolution(module.Name), module));
        }

        return base.Problems;
    }
}

Rule definition in the XML rules file:

<Rule TypeName="DoNotUseWildcardsInVersion" 
          Category="VBMigration" CheckId="AA1001">
    <Name>
        Do not use wildcards in an assembly's version number
    </Name>
    <Description>
        Wildcards have been used in an assembly's version number..
    </Description>
    <Url>
        http://www.thescarms.com/
    </Url>
    <Resolution>
        Do not use wildcards in an assembly's version number. You should
        explicitly set all components of an assembly's version number.
    </Resolution>
    <MessageLevel Certainty="80">
        Warning
    </MessageLevel>
    <FixCategories>
        NonBreaking
    </FixCategories>
    <Owner />
<Rule>

 

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