35 lines
896 B
Plaintext
35 lines
896 B
Plaintext
``++GetHashCode++`` is used to file an object in a ``++Dictionary++`` or ``++Hashtable++``. If ``++GetHashCode++`` uses non-``++readonly++`` fields and those fields change after the object is stored, the object immediately becomes mis-filed in the ``++Hashtable++``. Any subsequent test to see if the object is in the ``++Hashtable++`` will return a false negative.
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== Noncompliant Code Example
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----
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public class Person
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{
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public int age;
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public string name;
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public override int GetHashCode()
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{
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int hash = 12;
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hash += this.age.GetHashCode(); // Noncompliant
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hash += this.name.GetHashCode(); // Noncompliant
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return hash;
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}
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----
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== Compliant Solution
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----
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public class Person
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{
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public readonly DateTime birthday;
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public string name;
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public override int GetHashCode()
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{
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int hash = 12;
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hash += this.birthday.GetHashCode();
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return hash;
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}
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----
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