Select IQueryable rows where datatime is null in the database











up vote
0
down vote

favorite












I have an IQueryable that is supplied data from a SQL connection. There is a DateTime column in this which can contain nulls. I basically need to be able to get all the rows that have a null datetime value but nothing I am trying seems to work.
This is something like my latest attempt but it just simply fails trying to convert the "null" string to a DateTime format:



IQueryable dataByDate = allData.Where("DateTimeColumnName" + " == @0", (dateValueVariableAsString == null) ? "NULL" : dateValueVariableAsString );


If dateValueVariableAsString has a string with of a valid DateTime format then the I do get the results I expect - however I just cant seem to be able to get the rows where the dateColumn has nulls.






c# datetime null iqueryable







share|improve this question




























    up vote
    0
    down vote

    favorite












    I have an IQueryable that is supplied data from a SQL connection. There is a DateTime column in this which can contain nulls. I basically need to be able to get all the rows that have a null datetime value but nothing I am trying seems to work.
    This is something like my latest attempt but it just simply fails trying to convert the "null" string to a DateTime format:



    IQueryable dataByDate = allData.Where("DateTimeColumnName" + " == @0", (dateValueVariableAsString == null) ? "NULL" : dateValueVariableAsString );


    If dateValueVariableAsString has a string with of a valid DateTime format then the I do get the results I expect - however I just cant seem to be able to get the rows where the dateColumn has nulls.






    c# datetime null iqueryable







    share|improve this question


























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have an IQueryable that is supplied data from a SQL connection. There is a DateTime column in this which can contain nulls. I basically need to be able to get all the rows that have a null datetime value but nothing I am trying seems to work.
      This is something like my latest attempt but it just simply fails trying to convert the "null" string to a DateTime format:



      IQueryable dataByDate = allData.Where("DateTimeColumnName" + " == @0", (dateValueVariableAsString == null) ? "NULL" : dateValueVariableAsString );


      If dateValueVariableAsString has a string with of a valid DateTime format then the I do get the results I expect - however I just cant seem to be able to get the rows where the dateColumn has nulls.






      c# datetime null iqueryable







      share|improve this question















      I have an IQueryable that is supplied data from a SQL connection. There is a DateTime column in this which can contain nulls. I basically need to be able to get all the rows that have a null datetime value but nothing I am trying seems to work.
      This is something like my latest attempt but it just simply fails trying to convert the "null" string to a DateTime format:



      IQueryable dataByDate = allData.Where("DateTimeColumnName" + " == @0", (dateValueVariableAsString == null) ? "NULL" : dateValueVariableAsString );


      If dateValueVariableAsString has a string with of a valid DateTime format then the I do get the results I expect - however I just cant seem to be able to get the rows where the dateColumn has nulls.






      c# datetime null iqueryable




      c# datetime null iqueryable






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 2 days ago

























      asked 2 days ago









      CJH

      320315




      320315
























          1 Answer
          1






          active

          oldest

          votes

















          up vote
          1
          down vote













          I finally got this sorted with the following alteration to my example above:



          IQueryable dataByDate = allData.Where("DateTimeColumnName == null", null);





          share|improve this answer





















            Your Answer






            StackExchange.ifUsing("editor", function () {
            StackExchange.using("externalEditor", function () {
            StackExchange.using("snippets", function () {
            StackExchange.snippets.init();
            });
            });
            }, "code-snippets");

            StackExchange.ready(function() {
            var channelOptions = {
            tags: "".split(" "),
            id: "1"
            };
            initTagRenderer("".split(" "), "".split(" "), channelOptions);

            StackExchange.using("externalEditor", function() {
            // Have to fire editor after snippets, if snippets enabled
            if (StackExchange.settings.snippets.snippetsEnabled) {
            StackExchange.using("snippets", function() {
            createEditor();
            });
            }
            else {
            createEditor();
            }
            });

            function createEditor() {
            StackExchange.prepareEditor({
            heartbeatType: 'answer',
            convertImagesToLinks: true,
            noModals: true,
            showLowRepImageUploadWarning: true,
            reputationToPostImages: 10,
            bindNavPrevention: true,
            postfix: "",
            imageUploader: {
            brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
            contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
            allowUrls: true
            },
            onDemand: true,
            discardSelector: ".discard-answer"
            ,immediatelyShowMarkdownHelp:true
            });


            }
            });














             

            draft saved


            draft discarded


















            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53373581%2fselect-iqueryable-rows-where-datatime-is-null-in-the-database%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown

























            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            1
            down vote













            I finally got this sorted with the following alteration to my example above:



            IQueryable dataByDate = allData.Where("DateTimeColumnName == null", null);





            share|improve this answer

























              up vote
              1
              down vote













              I finally got this sorted with the following alteration to my example above:



              IQueryable dataByDate = allData.Where("DateTimeColumnName == null", null);





              share|improve this answer























                up vote
                1
                down vote










                up vote
                1
                down vote









                I finally got this sorted with the following alteration to my example above:



                IQueryable dataByDate = allData.Where("DateTimeColumnName == null", null);





                share|improve this answer












                I finally got this sorted with the following alteration to my example above:



                IQueryable dataByDate = allData.Where("DateTimeColumnName == null", null);






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 2 days ago









                CJH

                320315




                320315






























                     

                    draft saved


                    draft discarded



















































                     


                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function () {
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53373581%2fselect-iqueryable-rows-where-datatime-is-null-in-the-database%23new-answer', 'question_page');
                    }
                    );

                    Post as a guest















                    Required, but never shown





















































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown

































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown







                    Popular posts from this blog

                    'app-layout' is not a known element: how to share Component with different Modules

                    Image
                    0 My application was working fine until I decided to go with lazy loading: So, my shared component looks like this: import { Component, Renderer2 } from '@angular/core'; export interface FormModel { captcha?: string; } @Component({ selector: 'app-layout', templateUrl: './app-layout.component.html', styleUrls: ['./app-layout.css'] }) export class FullLayoutComponent { } app-layout.component.ts I am using this component in my Another component say school-home.component.html like this: <app-layout> </app-layout> and it was working fine until I created a Module school-home.module.ts like this: import { NgModule } from '@angular/core'; import { CommonModule } from '@angular/common'; import { SchoolhomeRoutingModule ...
                    Read more

                    android studio warns about leanback feature tag usage required on manifest while using Unity exported app?

                    Image
                    .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box; } 0 This is a simple project showing cubes on Unity, exported to android project and imported on Android studio. On maifest file it showed following warning: Expecting <uses-feature android:name="android.software.leanback" android:required="false" /> tag I have no information about it. And also on default emptyview android project does not use/mention this feature. I know it is required by TV's and such but why its not added by default? Why is this? And Should I concern about it? android unity3d ...
                    Read more

                    WPF add header to Image with URL pettitions [duplicate]

                    Image
                    up vote 0 down vote favorite This question already has an answer here: Image source URI requiring authorization 3 answers Add header to all* HTTP requests on a machine 1 answer first of all sorry for my english. Recently I added some security in the backend of my project, and now I need to send a validation code(apiKey) inside the headers to retrieve the images. I have a problem with ALL images in my project that I had attached in my UI. For example, before I had: <Image Height="90" Source="{Binding Video.Thumbnail}"/> Now I need to change my code to create a CUSTOM petition add the apiKey in the header:...
                    Read more