/// <summary>
/// Compare one assembly name to another.
/// </summary>
/// <param name="that"></param>
/// <returns></returns>
internal int CompareTo(AssemblyNameExtension that)
{
// Are they identical?
if (this.Equals(that))
{
return(0);
}
// Are the base names not identical?
int result = CompareBaseNameTo(that);
if (result != 0)
{
return(result);
}
// We need some collating order for these, alphabetical by FullName seems as good as any.
return(String.Compare(this.FullName, that.FullName, StringComparison.OrdinalIgnoreCase));
}
/// <summary>
/// Compare two base names as quickly as possible.
/// </summary>
/// <param name="that"></param>
/// <returns></returns>
internal int CompareBaseNameTo(AssemblyNameExtension that)
{
int result = CompareBaseNameToImpl(that);
#if DEBUG
// Now, compare to the real value to make sure the result was accurate.
AssemblyName a1 = this.asAssemblyName;
AssemblyName a2 = that.asAssemblyName;
if (a1 == null)
{
a1 = new AssemblyName(this.asString);
}
if (a2 == null)
{
a2 = new AssemblyName(that.asString);
}
int baselineResult = String.Compare(a1.Name, a2.Name, StringComparison.OrdinalIgnoreCase);
Debug.Assert(result == baselineResult, "Optimized version of CompareBaseNameTo didn't return the same result as the baseline.");
#endif
return(result);
}
/// <summary>
/// Compare two assembly names for equality.
/// </summary>
/// <param name="that"></param>
/// <returns></returns>
internal bool Equals(AssemblyNameExtension that)
{
// Pointer compare.
if (this == that)
{
return(true);
}
// Do both have assembly names?
if (this.asAssemblyName != null && that.asAssemblyName != null)
{
// Pointer compare.
if (this.asAssemblyName == that.asAssemblyName)
{
return(true);
}
}
// Do both have strings that equal each-other?
if (this.asString != null && that.asString != null)
{
if (this.asString == that.asString)
{
return(true);
}
// If they weren't identical then they might still differ only by
// case. So we can't assume that they don't match. So fall through...
}
// Do the names match?
if (0 != String.Compare(Name, that.Name, StringComparison.OrdinalIgnoreCase))
{
return(false);
}
// Do the versions match?
if (Version != that.Version)
{
return(false);
}
// Do the Cultures match?
CultureInfo aCulture = CultureInfo;
CultureInfo bCulture = that.CultureInfo;
if (aCulture == null)
{
aCulture = CultureInfo.InvariantCulture;
}
if (bCulture == null)
{
bCulture = CultureInfo.InvariantCulture;
}
if (aCulture.LCID != bCulture.LCID)
{
return(false);
}
// Do the PKTs match?
byte[] aPKT = GetPublicKeyToken();
byte[] bPKT = that.GetPublicKeyToken();
// Some assemblies (real case was interop assembly) may have null PKTs.
if (aPKT == null)
{
aPKT = new byte[0];
}
if (bPKT == null)
{
bPKT = new byte[0];
}
if (aPKT.Length != bPKT.Length)
{
return(false);
}
for (int i = 0; i < aPKT.Length; ++i)
{
if (aPKT[i] != bPKT[i])
{
return(false);
}
}
return(true);
}