public static object GetNullKey(Type type)
{
type = TypeHelper.CheckNullable(type);
if (type.IsEnum)
{
return(Enum.ToObject(type, int.MinValue));
}
if (nullKeys.TryGetValue(type, out var value))
{
return(value);
}
return(FormatterServices.GetUninitializedObject(type));
}
private string FormatValue()
{
if (Invoker == null)
{
return(Value.ToString());
}
if (Value == null)
{
return("null");
}
if (Value is IQueryFormatable formatable)
{
return(formatable.Format());
}
if (Value is DateTime date)
{
return($"'{date.ToString("yyyy.MM.dd")}'");
}
var type = TypeHelper.CheckNullable(Invoker.DataType);
if (Value is string stringValue)
{
if (Comparer.Type == CompareTypes.Like && stringValue.IndexOf('%') < 0)
{
return($"'%{stringValue}%'");
}
else if (Comparer.Type == CompareTypes.In)
{
return(stringValue);
}
return($"'{stringValue}'");
}
else if (Value is IEnumerable enumerable)
{
return(string.Concat('(', string.Join(", ", enumerable.Cast <object>().Select(p => p is string ps ? $"'{ps}'" : p?.ToString())), ')'));
}
else
{
return(Value.ToString());
}
}
public static object GetNullKey(Type type)
{
type = TypeHelper.CheckNullable(type);
if (type == typeof(string))
{
return("magic ZeRo String Va!@#;)(*&ue");//, (IEqualityComparer<K>)StringComparer.OrdinalIgnoreCase);
}
if (type.IsEnum)
{
return(Enum.ToObject(type, int.MinValue));
}
if (type == typeof(bool))
{
return(false);
}
if (type == typeof(long))
{
return(long.MinValue);
}
else if (type == typeof(int))
{
return(int.MinValue);
}
else if (type == typeof(short))
{
return(short.MinValue);
}
else if (type == typeof(char))
{
return(char.MinValue);
}
else if (type == typeof(sbyte))
{
return(sbyte.MinValue);
}
else if (type == typeof(ulong))
{
return(ulong.MinValue);
}
else if (type == typeof(uint))
{
return(uint.MinValue);
}
else if (type == typeof(ushort))
{
return(uint.MinValue);
}
else if (type == typeof(byte))
{
return(byte.MinValue);
}
else if (type == typeof(decimal))
{
return(decimal.MinValue);
}
else if (type == typeof(double))
{
return(double.MinValue);
}
else if (type == typeof(float))
{
return(float.MinValue);
}
return(FormatterServices.GetUninitializedObject(type));
}