[英]C# Equality for classes having array properties
我有以下价值
public class Identification : IEquatable<Identification>
{
public int Id { get; set; }
public byte[] FileContent { get; set; }
public int ProjectId { get; set; }
}
我用 resharper 生成了平等成员
public bool Equals(Identification other)
{
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return Id == other.Id && Equals(FileContent, other.FileContent) && ProjectId == other.ProjectId;
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != this.GetType()) return false;
return Equals((Identification) obj);
}
public override int GetHashCode()
{
unchecked
{
var hashCode = Id;
hashCode = (hashCode*397) ^ (FileContent != null ? FileContent.GetHashCode() : 0);
hashCode = (hashCode*397) ^ ProjectId;
return hashCode;
}
}
public static bool operator ==(Identification left, Identification right)
{
return Equals(left, right);
}
public static bool operator !=(Identification left, Identification right)
{
return !Equals(left, right);
}
但是当我想对它从存储库返回之前和之后的相等性进行单元测试时,它失败了。 尽管在失败消息中具有完全相同的属性。
var identification = fixture
.Build<Identification>()
.With(x => x.ProjectId, projet.Id)
.Create();
await repository.CreateIdentification(identification);
var returned = await repository.GetIdentification(identification.Id);
Assert.Equal() 失败
预期:标识 { FileContent = [56, 192, 243], Id = 8, ProjectId = 42 }
实际:标识 { FileContent = [56, 192, 243], Id = 8, ProjectId = 42 }
如果重要的话,我将 Npgsql 与 Dapper 一起使用。
您应该将Enumerable.SequenceEqual
用于检查以下各项的数组:
null
或两个数组都不为null
。Length
。像这样的东西
public bool Equals(Identification other)
{
if (ReferenceEquals(null, other))
return false;
else if (ReferenceEquals(this, other))
return true;
return Id == other.Id &&
ProjectId == other.ProjectId &&
Enumerable.SequenceEqual(FileContent, other.FileContent);
}
由于Enumerable.SequenceEqual
可能很耗时,我已经将它移到比较的末尾(如果ProjectId
不相等,则无需检查数组)
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