.net - How to compare list of X to list of Y in C# by using generics? -

-

i have 2 classes, x , y. both classes have same similar property below.

class x {     public string t1 { get; set; }     public string t2 { get; set; }     public string t3 { get; set; } }  class y {     public string t1 { get; set; }     public string t2 { get; set; }     public string t3 { get; set; }      public string o1 { get; set; } }

i've couple hundreds classes similar x , y; similar structure, , decide create generic class problem.

i have list of x , y , want compare them t1; 1 property, find out element exist on both list, element exist on x , on y.

how can this?

the best thing first create interface contains t1 only. inherit each class x , y interface. can create generic classes or helper classes based on interface.

alternatively, may use reflection, or if use c# 4.0, can use dynamic. classic reflection way slow (large) lists, unless cache method calls, shouldn't take approach. c# 4.0 however, provided method caching through dlr, sufficiently fast in cases.

alternatively (2): when want "right" , want compare lists using standard mechanisms linq, should implement icomparable. can combinee generics create type-safety.

// interface, inherit icomparable public interface ix : icomparable<ix> {     string t1 { get; set; } }  // create 1 base class class xbase : ix {     public string t1 { get; set; }     public int compareto(ix obj)     {         return this.t1.equals(obj.t1);     } }  // inherit others base class class x : xbase {     public string t2 { get; set; }     public string t3 { get; set; } }  class y : xbase {     public string t2 { get; set; }     public string t3 { get; set; }      public strign o1 { get; set; } }

there many other ways. last method above has advantage of once writing logic t1 , compareto, saves clutter , creates clarity in code.


Comments

Post a Comment

Popular posts from this blog

c++ - How do I get a multi line tooltip in MFC -

-
right now, have tool tip pops when hover on edit box. problem tool tip contains multiple error messages , in 1 long line. need have each error message on own line. error messages contained in cstring new line seperating them. my existing code below. bool ontooltiptext(uint, nmhdr* pnmhdr, lresult* presult) { assert(pnmhdr->code == ttn_needtexta || pnmhdr->code == ttn_needtextw); // need handle both ansi , unicode versions of message tooltiptexta* pttta = (tooltiptexta*)pnmhdr; tooltiptextw* ptttw = (tooltiptextw*)pnmhdr; // tchar szfulltext[256]; cstring strtiptext=_t(""); uint nid = pnmhdr->idfrom; if (pnmhdr->code == ttn_needtexta && (pttta->uflags & ttf_idishwnd) || pnmhdr->code == ttn_needtextw && (ptttw->uflags & ttf_idishwnd)) { // idfrom hwnd of tool nid = ::getdlgctrlid((hwnd)nid); } //m_errprojaccel[ch] contains 1 or more error messages each...
Read more

asp.net - In javascript how to find the height and width -

-
i having .aspx , masterpage page. in masterpage loading aspx page . in aspx page design using generating table structure using code-behind server in javascript how find height , width . regards, kumar if you're looking table height , width, should it var tbl = document.getelementbyid('tbldemo'); alert(tbl.offsetwidth + '\n' + tbl.offsetheight);
Read more

c# - DataTable to EnumerableRowCollection -

-
i have datatable according client requirement can contain invalid date "00/00/1999",null,empty string.(typed datset) when collect them enumerables wish convert of invalid forms empty string. (i.e) enumerablerowcollection<datarow> query = order in _table.asenumerable() select new { orderdate= string.isnullorempty(convert.tostring(order.field<datetime>("orderdate")) || (how check date invalid date) ? string.empty : order.field<datetime>("orderdate") } how check whether date valid date or not? datetime.tryparse...like given current code: datetime date; enumerablerowcollection<datarow> query = order in _table.asenumerable() select new { orderdate= string.isnullorempty(convert.tostring(order.field<datetime>("orderdate")) || !datetime.tryparse(convert.tostring(order.field<datetime...
Read more