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100 lines
3.0 KiB
100 lines
3.0 KiB
using System;
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/// <summary>装箱类。</summary>
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public class Class<T> : IComparable, IComparable<T>, IComparable<Class<T>>
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{
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private bool _hashcode = false;
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private bool _equals = false;
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/// <summary>装箱对象。</summary>
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public virtual T Value { get; set; }
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/// <summary></summary>
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public virtual bool IsNull
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{
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get { return Value == null; }
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}
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/// <summary></summary>
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public virtual bool HasValue
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{
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get { return Value != null; }
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}
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/// <summary>创建默认值。</summary>
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public Class(T value = default, bool tryValueEquals = true, bool tryValueHashCode = true)
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{
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Value = value;
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_hashcode = tryValueHashCode;
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_equals = tryValueEquals;
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}
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/// <summary></summary>
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public override int GetHashCode()
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{
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if (_hashcode && Value != null)
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{
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return Value.GetHashCode();
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}
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return base.GetHashCode();
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}
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/// <summary></summary>
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public override bool Equals(object obj)
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{
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if (_equals)
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{
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if (Value == null && obj == null) return true;
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if (Value == null && obj != null) return false;
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if (Value != null && obj == null) return false;
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return Value.Equals(obj);
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}
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return base.Equals(obj);
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}
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/// <summary></summary>
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public override string ToString()
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{
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if (Value == null) return null;
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return Value.ToString();
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}
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/// <summary></summary>
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/// <exception cref="MissingMemberException"></exception>
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/// <exception cref="NotSupportedException"></exception>
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public virtual int CompareTo(object obj)
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{
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if (obj != null && obj is T) return CompareTo((T)obj);
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if (obj != null && obj is Class<T>) return CompareTo(obj as Class<T>);
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if (Value == null) throw new MissingMemberException(typeof(T).FullName, nameof(Value));
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if (!(Value is IComparable)) throw new NotSupportedException();
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return ((IComparable)Value).CompareTo(obj);
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}
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/// <summary></summary>
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/// <exception cref="MissingMemberException"></exception>
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/// <exception cref="NotSupportedException"></exception>
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public virtual int CompareTo(T other)
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{
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if (Value == null) throw new MissingMemberException(typeof(T).FullName, nameof(Value));
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if (!(Value is IComparable)) throw new NotSupportedException();
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return ((IComparable<T>)Value).CompareTo(other);
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}
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/// <summary></summary>
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/// <exception cref="MissingMemberException"></exception>
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/// <exception cref="NotSupportedException"></exception>
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public virtual int CompareTo(Class<T> other)
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{
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if (Value == null) throw new MissingMemberException(typeof(T).FullName, nameof(Value));
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if (other == null || !other.HasValue) return 1;
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if (Value is IComparable) return ((IComparable)Value).CompareTo(other.Value);
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if (Value is IComparable<T>) return ((IComparable<T>)Value).CompareTo(other.Value);
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throw new NotSupportedException();
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}
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}
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