public static T GetValueOrNull <T>(
this IDictionary <string, StringValues> queryStrings,
string key,
TryParseVal <StringValues, T> factory)
where T : class
{
var value = queryStrings.GetStr(key);
T retVal;
if (!value.HasValue || !factory(value.Value, out retVal))
{
retVal = null;
}
return(retVal);
}
public static T?GetNullableValue <T>(
this IDictionary <string, StringValues> queryStrings,
string key,
TryParseVal <StringValues, T> factory)
where T : struct
{
T? retVal;
var value = queryStrings.GetStr(key);
T val;
if (value.HasValue && factory(value.Value, out val))
{
retVal = val;
}
else
{
retVal = null;
}
return(retVal);
}
