/// <summary>
/// 返回指定类型的对象，其值等效于指定对象。
/// </summary>
/// <param name="context"> </param>
/// <param name="input"> 需要转换类型的对象 </param>
/// <param name="outputType"> 换转后的类型 </param>
/// <param name="success"> 是否成功 </param>
protected override string ChangeType(ConvertContext context, object input, Type outputType, out bool success)
{
success = true;
if (input is DataRow || input is DataRowView)
{
return(ComponentServices.ToJsonString(input));
}
var reader = input as IDataReader;
if (reader != null)
{
if (reader.IsClosed)
{
success = false;
context.AddException("DataReader已经关闭");
return(null);
}
switch (reader.FieldCount)
{
case 0:
return(null);
case 1:
return(BaseChangeType(context, reader.GetValue(0), outputType, out success));
default:
return(ComponentServices.ToJsonString(input));
}
}
if ((input == null) || input is DBNull)
{
return(null);
}
if (input is bool)
{
return((bool)input ? "true" : "false");
}
var convertible = input as IConvertible;
if (convertible != null)
{
return(convertible.ToString(null));
}
var formattable = input as IFormattable;
if (formattable != null)
{
return(formattable.ToString(null, null));
}
var type = input as Type;
if (type != null)
{
return(CType.GetFriendlyName(type));
}
var bs = input as byte[];
if (bs != null)
{
return(Encoding.UTF8.GetString(bs));
}
var ps = input.GetType().GetProperties();
if (ps.Length > 0)
{
return(ComponentServices.ToJsonString(input));
}
return(input.ToString());
}
