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// Read-only fields

private readonly j__TPar i__Field;

private readonly j__TPar i__Field;

private readonly j__TPar i__Field;

// Default constructor

public <>f__AnonymousType0(j__TPar Color,

j__TPar Make, j__TPar CurrentSpeed);

// Overridden methods

public override bool Equals(object value);

public override int GetHashCode();

public override string ToString();

// Read-only properties

public j__TPar Color { get; }

public j__TPar CurrentSpeed { get; }

public j__TPar Make { get; }

}

The Implementation of ToString() and GetHashCode()

All anonymous types automatically derive from System.Object and are provided with an overridden

version of Equals(), GetHashCode(), and ToString(). The ToString() implementation simply builds

a string from each name/value pair, for example:

C H A P T E R   1 3  

■

C #   2 0 0 8   L A N G U A G E   F E AT U R E S

442

8849CH13.qxd  10/2/07  12:42 PM  Page 442

---

public override string ToString()

{

StringBuilder builder = new StringBuilder();

builder.Append("{ Color = ");

builder.Append(this.i__Field);

builder.Append(", Make = ");

builder.Append(this.i__Field);

builder.Append(", CurrentSpeed = ");

builder.Append(this.i__Field);

builder.Append(" }");

return builder.ToString();

}

The GetHashCode() implementation computes a hash value using each anonymous type’s

member variables as input to the System.Collections.Generic.EqualityComparer type. Using

this implementation of GetHashCode(), two anonymous types will yield the same hash value if (and

only if ) they have the same set of properties that have been assigned the same values. Given this

implementation, anonymous types are well suited to be contained within a Hashtable container.