为什么OracleParameter实现ICloneable但不提供Clone()？

Question

我使用的是OracleClient库版本1.0.5000.0,我对该OracleParameter类及其实现感到困惑ICloneable.

这是OracleParameter类的定义:

public sealed class OracleParameter : MarshalByRefObject, IDbDataParameter, IDataParameter, ICloneable {
    public OracleParameter();
    public OracleParameter(string name, object value);
    public OracleParameter(string name, OracleType oracleType);
    public OracleParameter(string name, OracleType oracleType, int size);
    public OracleParameter(string name, OracleType oracleType, int size, string srcColumn);
    public OracleParameter(string name, OracleType oracleType, int size, ParameterDirection direction, bool isNullable, byte precision, byte scale, string srcColumn, DataRowVersion srcVersion, object value);

    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    [RefreshProperties(RefreshProperties.All)]
    [Browsable(false)]
    public DbType DbType { get; set; }
    [RefreshProperties(RefreshProperties.All)]
    public ParameterDirection Direction { get; set; }
    [Browsable(false)]
    [DesignOnly(true)]
    [EditorBrowsable(EditorBrowsableState.Never)]
    [DefaultValue(false)]
    public bool IsNullable { get; set; }
    [DefaultValue(0)]
    [Browsable(false)]
    public int Offset { get; set; }
    [RefreshProperties(RefreshProperties.All)]
    public OracleType OracleType { get; set; }
    [DefaultValue("")]
    public string ParameterName { get; set; }
    [DefaultValue(0)]
    public byte Precision { get; set; }
    [DefaultValue(0)]
    public byte Scale { get; set; }
    [DefaultValue(0)]
    public int Size { get; set; }
    [DefaultValue("")]
    public string SourceColumn { get; set; }
    public DataRowVersion SourceVersion { get; set; }
    [DefaultValue("")]
    [RefreshProperties(RefreshProperties.All)]
    [TypeConverter(typeof(StringConverter))]
    public object Value { get; set; }

    public override string ToString();
}

它实现了System.ICloneable,但那里没有Clone()方法.

有谁能解释一下？

Answer 1

在.NET中,您可以使用以下语法显式实现接口成员:

对象System.IClonable.Clone(){}

因此,您只能通过显式转换到预期的接口来使用该方法.

另请参阅 http://msdn.microsoft.com/en-us/library/system.data.oracleclient.oracleparameter.system.icloneable.clone(VS.85).aspx