/// <summary>
/// 获取排序表达式树
/// </summary>
/// <param name="propertySource">属性名</param>
/// <returns></returns>
public LambdaExpression GetSortedExpression(string propertySource)
{
var exp = PropertiesMapping.Find(x => GetPropertyInfo(x.Item2).Name == propertySource);
if (exp == null)
{
throw new PropertyNoExistException(propertySource, TargetType);
}
// 更改参数
var visitor = new MapperExpressionVisitor(paramClassSource);
var result = visitor.Visit(exp.Item1);
return Expression.Lambda(result, paramClassSource);
}
internal Expression GetLambdaDest(string propertyName)
{
var exp = PropertiesMapping.Find(x => GetPropertyInfo(x.Item1).Name == propertyName);
if (exp != null)
{
var final = exp.Item2;
if (final.NodeType == ExpressionType.Convert)
{
final = (final as UnaryExpression).Operand;
}
return final;
}
return null;
}
internal LambdaExpression GetSortedExpression(string propertySource)
{
Contract.Requires(!string.IsNullOrEmpty(propertySource));
Expression result = null;
var exp = PropertiesMapping.Find(x => GetPropertyInfo(x.Item2).Name == propertySource);
if (exp == null)
{
throw new PropertyNoExistException(propertySource, TargetType);
}
// To change the parameter.
var visitor = new MapperExpressionVisitor(paramClassSource);
result = visitor.Visit(exp.Item1);
return(Expression.Lambda(result, paramClassSource));
}