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Latest Blog

Entity Framework Code First Migrations

Wednesday, December 19, 2018 mcchu28
You need to use Package Management Console to run EF commands. In Visual Studio, go to Tools > NuGet Package Manager > Package Manager Console.


These are some key commands when doing EF migrations:
  • Enable-Migrations
  • Add-Migration TableAdd-YourTableName
  • update-database -script
  • Update-Database
  • Update-Database –TargetMigration: 201708161739489_TableAdd-YourTableName


update-database -script
  • generate script file that has not been applied to database yet
update-database
    • apply database migration changes to the database
    • ensure you are pointing to the right database environment in your web.config or app.config before you run this command

    For more information on Code First Migrations, visit:


    Read more

    Umbraco Forms - Library.GetApprovedRecordsFromForm(formId) Object reference not set to an instance of an object

    Friday, December 7, 2018 mcchu28
    An exception of type 'System.NullReferenceException' occurred in Umbraco.Forms.Web.dll but was not handled in user code

    Additional information: Object reference not set to an instance of an object.

    at Umbraco.Forms.Mvc.DynamicObjects.Library.GetApprovedRecordsFromForm(String formId)

    Workaround: I had this issue when I call the library in its own test project. I believe the connection to Umbraco database is not setup properly. I call this function within the Umbraco project and it seems fine after.

    Read more

    Umbraco Forms - There is already an open DataReader associated with this Command which must be closed first

    Friday, December 7, 2018 mcchu28
    An exception of type 'System.InvalidOperationException' occurred in Umbraco.Core.dll but was not handled in user code

    Additional information: There is already an open DataReader associated with this Command which must be closed first.

    Solution: Add to your connection string in web.config to have MultipleActiveResultSets=True


    Stack trace:
    at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)
    at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command)
    at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)
    at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
    at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
    at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
    at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
    at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
    at StackExchange.Profiling.Data.ProfiledDbCommand.ExecuteDbDataReader(CommandBehavior behavior) in file:///c:/Code/github/SamSaffron/MiniProfiler/StackExchange.Profiling/Data/ProfiledDbCommand.cs:line 235
    at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader()
    at Umbraco.Core.Persistence.PetaPocoCommandExtensions.<>c__DisplayClass5_0.b__0()
    at Umbraco.Core.Persistence.FaultHandling.RetryPolicy.ExecuteAction[TResult](Func`1 func)
    at Umbraco.Core.Persistence.PetaPocoCommandExtensions.ExecuteReaderWithRetry(IDbCommand command, RetryPolicy cmdRetryPolicy, RetryPolicy conRetryPolicy)
    at Umbraco.Core.Persistence.PetaPocoCommandExtensions.ExecuteReaderWithRetry(IDbCommand command, RetryPolicy retryPolicy)
    at Umbraco.Core.Persistence.PetaPocoCommandExtensions.ExecuteReaderWithRetry(IDbCommand command)
    at Umbraco.Core.Persistence.Database.d__74`1.MoveNext()
    at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
    at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
    at Umbraco.Forms.Data.Storage.RecordFieldStorage.GetAllRecordFields(Record record, Form form)
    at Umbraco.Forms.Mvc.DynamicObjects.Library.QueryRecords(Guid formId, Int32 pageId, Boolean submitted)
    at Umbraco.Forms.Mvc.DynamicObjects.Library.GetApprovedRecordsFromForm(String formId)


    Read more

    Extending Umbraco Forms

    Thursday, December 6, 2018 mcchu28
    Extending Umbraco Forms

    Prepare your frontend - include required javascript

    < head>
	< script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-2.2.4.min.js">
	< script src="https://ajax.aspnetcdn.com/ajax/jquery.validate/1.15.0/jquery.validate.min.js">
	< script src="https://ajax.aspnetcdn.com/ajax/mvc/5.1/jquery.validate.unobtrusive.min.js">
< /head>



    Rendering Forms scripts where you want

    @if (TempData["UmbracoForms"] != null) { foreach (var form in (List)TempData["UmbracoForms"]) { Html.RenderAction("RenderFormScripts", "UmbracoForms", new { formid = form, theme = "yourTheme" }); } }
    Themes

    • ~\Views\Partials\Forms\Themes\default (default theme)
    • ~\Views\Partials\Forms\Themes\YourTheme (your own theme)

    Custom Markup

    You can customize the default views using the theme method above for the following:
    • fieldtype
    • script
    • form
    The FieldType (i.e. textfield, textarea, checkbox, etc) is using @Model.Id to match the value to the form field.


    Creating custom HTML emails

    You can include new Workflow "Send email with template (Razor)" to send out pretty HTML email.


    Working with Record data

    You can retrieve the form data filled out by users with different methods.


    Extending

    Textfield has a FieldType, render input field and save text strings
    workflow has a Workflow type
    datasource has a datasource type
    Prevalue Source Type
    Export Type - format data to a file

    Configuration

    You can update configuration values at:
    /App_Plugins/UmbracoForms/UmbracoForms.config


    Magic strings

    render values from session, cookies, Umbraco page fields


    Storing Form Files with IFileSystem

    You can store your forms, workflows, and preValues in a different location like the Azure Blob Cloud storage or some other place.















    Read more

    LINQ max sequence contains no elements C# .NET

    Friday, November 30, 2018 mcchu28
    You may encounter the following error when you are using LINQ Max function when sequence contains no elements.

    System.InvalidOperationException : Sequence contains no elements
    at System.Linq.Enumerable.Max(IEnumerable`1 source)

    In the following example, I try to get the maximum year from the list of models. You can check using Any function to see if the list of models are empty first before calling the Max function.

    List models = GetModels();
    if (!models.Any())
    return models;
    var latestYear = models.Max(x => x.Year);

    Read more

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