c# - InvalidCastException when converting String to String -


i've got unexplained error when working on controller class in rest api i'm working on.

the api takes datacomponent , gets data view. 1 of columns in view engineeringname(varchar(250), null)

when i'm iterating on dataset build jsonobject debugger shows me error:

an exception of type 'system.invalidcastexception' occurred in restfulwebapi.dll not handled in user code

this line fails on:

string engineername = row["engineername"].tostring();

the debugger's immediate window shows me when error occurs , check value is:

>>> ?row["engineername"]     >>> "j bloggs"

and

 >>> ?row["engineername"].tostring()      >>> "j bloggs"

i'm not sure other information can supply guys provide minimal, complete, , verifiable example please tell me if need else.

edits below:

stack trace:

restfulwebapi.dll!restfulwebapi.controllers.ole_foundationscontroller.getall() line 86 c#

(refers line i've supplied)

it seem visual studio's stack traces work in way refers line, exception may on line above (in cases). in case invalidcastexception referring line 86, castexception occuring on line 85.


-

Comments

Post a Comment

Popular posts from this blog

angular - Is it possible to get native element for formControl? -

i've got angular2 reactive form . created formcontrol s , assigned input fields by [formcontrol]=... . understand creates nativeelement <-> formcontrol link. my question: possible nativeelement formcontrol ? wanna myformcontrol.nativeelement.focus() i can share 1 terrible solution works me. in reactive forms can use either 1) formcontroldirective ts mycontrol = new formcontrol('') template <input type="text" [formcontrol]="mycontrol"> or 2) formcontrolname ts myform: formgroup; constructor(private fb: formbuilder) {} ngoninit() { this.myform = this.fb.group({ foo: '' }); } template <form [formgroup]="myform"> <input type="text" formcontrolname="foo"> </form> so these directives write patch like 1) formcontroldirective const originformcontrolngonchanges = formcontroldirective.prototype.ngonchanges; formcontroldirective.proto
Read more

unity3d - Rotate an object to face an opposite direction -

i have object , b. when click on object b, rotates object b (a faces b). b doesn't face a. need following : when faces b, need face opposite direction. have code rotating @ b. how rotate face opposite direction after that? vector3 targetdirection = target - transform.position; float step = speed * time.deltatime; vector3 newdirection = vector3.rotatetowards (turretdome.transform.forward, targetdirection, step, 0.0f); turretdome.transform.rotation = quaternion.lookrotation (newdirection); you object facing object b, want inverse direction of object after that? objecta.transform.rotation = quaternion.inverse(objecta.transform.rotation) but lets assume example turretdome object a, (negate direction): turretdome.transform.rotation = quaternion.lookrotation (-newdirection); naturally, both of these snippets not show how smoothen rotation, seem know how use time.deltatime. just incase unsure, quaternion.lerp this
Read more

javascript - Why jQuery Select box change event is now working? -

i working on product filters user select select box according his/her preference not getting selected value user in jquery. html code:- <select name="product_filter" id="product_filter"> <option value="price_low_first">price : low high</option> <option value="price_high_first">price : high low</option> <option value="latest">latest</option> <option value="popular">most popular</option> </select> jquery code: $(function () { $("#product_filter").change(function () { alert("hi") var selectedtext = $(this).find("option:selected").text(); var selectedvalue = $(this).val(); alert("selected text: " + selectedtext + " value: " + selectedvalue); }); }); hi believe code perfect. once please check jquery.min.js
Read more