private void Test1()
{
Expression <Func <People, Boolean> > where = p => (p.Amount > 4000 || p.Amount < 4500) && p.Name.Length > 2;
ExpressionReplaceType <People, Teacher> replace = new ExpressionReplaceType <People, Teacher>();
var newWhere = replace.ReplaceBodyType(where) as Expression <Func <Teacher, Boolean> >;
WriteLine(new ParsingExpressionTrees().ParsingExpression(newWhere));
foreach (Teacher item in teachers.Where(newWhere.Compile()))
{
WriteLine("Teacher：Name【{0}】，Amount【{1}】", item.Name, item.Amount);
}
}
private void Test2()
{
var Parsing = new ParsingExpressionTrees();
Expression <Func <People, Student, Boolean> > where = (p, s) => (p.Amount > 4000 || s.Amount < 400) && p.Name.Length > 3 && s.Name.Length > 2;
ExpressionReplaceType <Student, Teacher> replace1 = new ExpressionReplaceType <Student, Teacher>();
var newWhere1 = replace1.ReplaceBodyType(where) as Expression <Func <People, Teacher, Boolean> >;
var lambda1 = newWhere1.Compile();
WriteLine(Parsing.ParsingExpression(newWhere1));
ExpressionReplaceType <People, Teacher> replace2 = new ExpressionReplaceType <People, Teacher>();
var newWhere2 = replace2.ReplaceBodyType(newWhere1) as Expression <Func <Teacher, Teacher, Boolean> >;
var lambda2 = newWhere2.Compile();
WriteLine(Parsing.ParsingExpression(newWhere2));
}