public static bool TryParse(string text, out ConditionalRange <T> result)
{
result = null;
if (string.IsNullOrWhiteSpace(text))
{
return(false);
}
text = text.Trim().Trim('(', ')');
if (string.IsNullOrWhiteSpace(text))
{
return(false);
}
var parts = text.Split('~').Select(p => p.Trim().Trim('?', '*')).ToArray();
if (!string.IsNullOrWhiteSpace(parts[0]))
{
T from;
if (!Zongsoft.Common.Convert.TryConvertValue(parts[0], out from))
{
return(false);
}
if (result == null)
{
result = new ConditionalRange <T>();
}
result.From = from;
}
if (parts.Length > 1 && !string.IsNullOrWhiteSpace(parts[1]))
{
T to;
if (!Zongsoft.Common.Convert.TryConvertValue(parts[1], out to))
{
return(false);
}
if (result == null)
{
result = new ConditionalRange <T>();
}
result.To = to;
}
//最后返回真（即使输出参数为空）
return(true);
}
public void Test()
{
var age = new ConditionalRange <byte>(100, 18);
var ageText = age.ToString();
var birthdate = new ConditionalRange <DateTime>(new DateTime(1979, 6, 9), null);
var birthdateText = birthdate.ToString();
var range = ConditionalRange <int> .Parse(ageText);
Assert.NotNull(range);
Assert.Equal(18, range.From);
Assert.Equal(100, range.To);
range = Common.Convert.ConvertValue <ConditionalRange <int> >(ageText);
Assert.NotNull(range);
Assert.Equal(18, range.From);
Assert.Equal(100, range.To);
}
protected bool IsDefaultValue(ConditionalConverterContext context)
{
if (Zongsoft.Common.TypeExtension.IsAssignableFrom(typeof(ConditionalRange), context.Type))
{
return(ConditionalRange.IsEmpty(context.Value as ConditionalRange));
}
if (context.Value == null || System.Convert.IsDBNull(context.Value))
{
return(context.DefaultValue == null || System.Convert.IsDBNull(context.DefaultValue));
}
if (context.DefaultValue == null)
{
return(false);
}
object defaultValue;
return(Zongsoft.Common.Convert.TryConvertValue(context.DefaultValue, context.Value.GetType(), out defaultValue) &&
object.Equals(context.Value, defaultValue));
}
public static bool IsEmpty(ConditionalRange value)
{
return(value == null || (value.From == null && value.To == null));
}
public static bool TryParse(string text, out ConditionalRange result)
{
return(TryParse <string>(text, out result));
}