public static Expression <Func <TSource, bool> > BuildSearchExpression(string searchKey,
MethodInfo method,
Expression <Func <TSource, string> > member,
params Expression <Func <TSource, string> >[] others)
{
var parameter = PagingQueryExtensions.GetParameterExpression(member);
var logics = member.ToSearchLambda(method, searchKey)
.Or(others.Select(m => m.ToSearchLambda(method, searchKey)).ToArray());
logics = new PagingQueryExtensions.ParameterReplacer(parameter).Visit(logics);
var expression = Expression.Lambda <Func <TSource, bool> > (logics, false, parameter);
return(expression);
}
/// <summary>
/// 构造 过滤表达式
/// </summary>
/// <returns></returns>
public Expression <Func <TSource, bool> > BuildExpression()
{
if (!expressions.Any())
{
return(s => true);
}
if (expressions.Count == 1)
{
return(expressions.First());
}
var first = expressions.First();
var logics = first.Or(expressions.Skip(1).ToArray());
var parameter = PagingQueryExtensions.GetParameterExpression(first);
logics = new PagingQueryExtensions.ParameterReplacer(parameter).Visit(logics);
return(Expression.Lambda <Func <TSource, bool> > (logics, false, parameter));
}