本文整理汇总了C#中MappingSchema.GetMapValues方法的典型用法代码示例。如果您正苦于以下问题：C# MappingSchema.GetMapValues方法的具体用法？C# MappingSchema.GetMapValues怎么用？C# MappingSchema.GetMapValues使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类MappingSchema的用法示例。
在下文中一共展示了MappingSchema.GetMapValues方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: GetToEnum
static Expression GetToEnum(Type @from, Type to, Expression expression, MappingSchema mappingSchema)
{
if (to.IsEnumEx())
{
var toFields = mappingSchema.GetMapValues(to);
if (toFields == null)
return null;
var fromTypeFields = toFields
.Select(f => new { f.OrigValue, attrs = f.MapValues.Where(a => a.Value == null || a.Value.GetType() == @from).ToList() })
.ToList();
if (fromTypeFields.All(f => f.attrs.Count != 0))
{
var cases = fromTypeFields
.Select(f => new
{
value = f.OrigValue,
attrs = f.attrs
.Where (a => a.Configuration == f.attrs[0].Configuration)
.Select(a => a.Value ?? mappingSchema.GetDefaultValue(@from))
.ToList()
})
.ToList();
var ambiguityMappings =
from c in cases
from a in c.attrs
group c by a into g
where g.Count() > 1
select g;
var ambiguityMapping = ambiguityMappings.FirstOrDefault();
if (ambiguityMapping != null)
{
var enums = ambiguityMapping.ToArray();
return Expression.Convert(
Expression.Call(
_throwLinqToDBConvertException,
Expression.Constant(
"Mapping ambiguity. MapValue({0}) attribute is defined for both '{1}.{2}' and '{1}.{3}'."
.Args(ambiguityMapping.Key, to.FullName, enums[0].value, enums[1].value))),
to);
}
var expr = Expression.Switch(
expression,
Expression.Convert(
Expression.Call(_defaultConverter,
Expression.Convert(expression, typeof(object)),
Expression.Constant(to)),
to),
cases
.Select(f =>
Expression.SwitchCase(
Expression.Constant(f.value),
(IEnumerable<Expression>)f.attrs.Select(a => Expression.Constant(a, @from))))
.ToArray());
return expr;
}
if (fromTypeFields.Any(f => f.attrs.Count(a => a.Value != null) != 0))
{
var field = fromTypeFields.First(f => f.attrs.Count == 0);
return Expression.Convert(
Expression.Call(
_throwLinqToDBConvertException,
Expression.Constant(
"Inconsistent mapping. '{0}.{1}' does not have MapValue(<{2}>) attribute."
.Args(to.FullName, field.OrigValue, from.FullName))),
to);
}
}
return null;
}