c# - Error after setting different datasources for datagridview combobox cells -

-

i trying display in datagridview control names , fields of database tables. in every row name of table displayed in first cell, , second column allows choose of fields of table.

to that, handling 'datagridview.cellbeginedit' event , fill datasource cell names of fields. when trying edit cells, provided list displayed correctly , can b chose fine.

however when try same in row, start getting dataerror events cell have edited.

event arguments datarow have 'formatting|display' in context field, , have message "value not allowed in datagridviewcomboboxcell" (or close it). in debug, cell event references has correct value field, datasource null , formattedvalue empty string. , displayed text changes blank.

how should resolved correctly? should derive own custom datagridview cell displays text has combobox editor? if so, how?

edit: here code using:

public class fielddataneededeventargs: eventargs {     public list<string> fieldnames     {         get; private set;     }     public string tablename     {         get; private set;     }     public referencefielddataneededeventargs(stringdata)         : base()     {         fieldnames = new list<string>();         tablename= data;     } }  ...  public event eventhandler<fielddataneededeventargs> fielddataneeded =         new eventhandler<fielddataneededeventargs>((sender, args) => { });  ...     //handler cellbeginedit     //dgvmatch - datagridview, docsreferencetotablematch class datagridview bound     private void dgvmatch_cellbeginedit(object sender, datagridviewcellcanceleventargs e)     {         if (e.columnindex == dgvmatch.columns["tablekey"].index)         {             docsreferencetotablematch data = dgvmatch.rows[e.rowindex].databounditem docsreferencetotablematch;             fielddataneededeventargs ea = new fielddataneededeventargs(data.tablename);             fielddataneeded(this, ea);             var cell = (dgvmatch.rows[e.rowindex].cells[e.columnindex] datagridviewcomboboxcell);             cell.datasource = ea.fieldnames;         }     }     //example handler fielddataneeded event     static void ld_referencefielddataneeded(object sender, referencefielddataneededeventargs e)     {         (int = 0; < 4; i++)         {             e.fieldnames.add(string.format("{0}_fld{1}", e.referencename, i));         }     }


Popular posts from this blog

How to calculate SNR of signals in MATLAB? -

-
i've encountered simple, yet fundamental problem on calculating snr: there several signals : s1 = original , pure clean signal without noise. n1 = white gaussian noise going added s1. s2 = s1 + n1 (the noisy signal before performing noise-reduction algorithm) s3 = noise-reduced signal (after performing noise reduction algorithm) n2 = s3 - s1 (the amount of noise after performing noise-reduction algorithm) now want compare snr before , after performing noise-reduction algorithm. which signals should consider snr_before!? s1/n1 or s2/n1 ? which signals should consider snr_after!? s3/n1 or s3/n2 ? which commands or functions should use in matlab in order compute snr_before , snr_after? thanks billion putting time on helping me. what know calculating snr before : snrbeforenoise = mean( signal .^ 2 ) / mean( noise .^ 2 ); and snr after : residual_noise = signal - noise_reduced_signal; snr_after = mean( signal .^ 2 ) / mean( residual_noise .^ 2
Read more

c# - Attempting to upload to FTP: System.Net.WebException: System error -

-
i have api takes in xml , uploads files based on information in xml. uploads on schedule (also xml), , have tested surrounding , know works. i getting error 40% of time on first file attempt upload in each time cycle (time cycle = 45 minutes files, 30 minutes others). here code upload: try { loggerftp.log("uploading file: " + filename, false); // create request. ftpwebrequest request = (ftpwebrequest)webrequest.create(appsettingsftp.ftpurl + @"/" + filename); request.method = webrequestmethods.ftp.uploadfile; request.timeout = 6000000; //set 100 minutes //request.timeout = -1; //set infinite // add login credentials. request.credentials = new networkcredential(appsettingsftp.ftplogin, appsettingsftp.ftppassword); // grab file contents. streamreader sourcestream = new streamreader(appsettingsftp.uploadfiledirectory + filename); byte[] filecontents = encoding.utf8.getbytes(sourcestream.readtoend()); sourcest
Read more

ios - UISlider customization: how to properly add shadow to custom knob image -

-
Image
i need place custom knob image shadow uislider. far have image of 38x38, of there region defines shadow of knob. now while using image, when slide knob extreme ends actual knob not able cover end points, hence end points visible under transparent region of knob image this code using customize uislider uiimage *slidebtimg = [uiimage imagenamed:sliderknobimg]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatenormal]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatehighlighted]; how can implement custom knob shadow beneath it, covering end points?? look inside uislider.h , there methods let customize slider knob , track needed. (ios 2.0 , above) // lets subclass lay out track , thumb needed - (cgrect)minimumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)maximumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)trackrectforbounds:(cgrect)bounds; - (cgrect)thumbrectforbounds:(cgrect)bounds trackrect:(cgrect)rect value:
Read more