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Nuget Error - Entity Framework

K
kalena last edited by

I'm starting with C# and I need a strength.
I tried to connect with the database, using the entity framework.
In the output of visual studio arose the following message:
System. TypeLoadException: Could not load type 'NuGet. NuGetConstants' from assembly 'NuGet. VisualStudio.
So I couldn't generate the classes.
Has anyone been through that?
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Alberto last edited by
Try to update the Entity Framework
```
update-package EntityFramework
```
If it doesn't work, uninstall and install again through:
```
Install-package EntityFramework 
```
(add) -Version xxx if you are installing an older version)
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The operation shall have one parameter with Stream typeYou have two parameters, one with string type, one with Stream type. Remove the first parameter from the definition of the method, and the error is gone.
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One new textBox was an example to illustrate.Each element added to the form needs to be assigned coordinates so that they don't bury each other. The next element shall be modified relative to the last inserted.using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace WindowsFormsApp2 { public partial class Form1 : Form { public static List<TextBox> TextBoxes = new List<TextBox>(); public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { TextBox newTextBox = new TextBox(); TextBox lastOldTextBox = TextBoxes.LastOrDefault(); if (lastOldTextBox == null) { newTextBox.Location = new Point(30, 50); newTextBox.Text = "Hello World!"; } else { newTextBox.Location = new Point(lastOldTextBox.Location.X, lastOldTextBox.Location.Y + 30); newTextBox.Text = $"Hello World! ({TextBoxes.Count})"; } TextBoxes.Add(newTextBox); this.Controls.Add(newTextBox); } private void button2_Click(object sender, EventArgs e) { int i = 0; string textBoxesDesc = string.Concat("[[", string.Join("],\n[", TextBoxes.Select(x => $"TextBox{i++}:{x.Text}")), "]]"); File.WriteAllText(@".....\textBoxes.txt", textBoxesDesc); } } }
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Search word in the first column of array
Software Programming • c sharp net array multidimensional array c languageontains • • emran

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As it is a somewhat more complex algorithm that requires some lines I find it more interesting to do a method that treats it. An extension method makes use more natural. But if you don't want to just extract internal logic. But creating abstractions is part of learning.To catch the size of the dimension the correct is to catch the beginning of the track and the end of it through the methods GetLowerBound() and GetUpperBound(). Can work with GetLength() in most cases, but not in all. I'd rather do it all the time. Even if it's an exercise. In fact it is even more important, when learning it is better to learn right. It's not enough to work. Even if you didn't want to use that, just watch that you use it Length does not take the size of the dimension.using static System.Console; public class Program { public static void Main() { var array = new string[1, 6] {{"texto", "", "", "", "", ""}}; if (array.ContainsInFirstCol("texto")) WriteLine("achou"); } } public static class ArrayExt { public static bool ContainsInFirstCol(this string[,] array, string search) { for (int row = array.GetLowerBound(0); row <= array.GetUpperBound(0); row++) { if (array[row, 0].Contains(search)) return true; } return false; } } See https://ideone.com/rctMC4 . And https://dotnetfiddle.net/AVRqwl . Also https://github.com/maniero/SOpt/blob/master/CSharp/Array/ContainsString.cs .Note that a array cannot increase in size. The AP response was made in such a way that the code cannot be used at other points where another array be declared with another size.
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Faced with the visa you are passing the xml and the slim parser is not understandable. I imagine the problem is here:data: { xml : xml} It is unlikely that the above code sends a xml as string. Just try:data: {xml} One way to verify what is coming on the server is to return what was sent and see in the browser tools the answer.
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You mean that all records have unique email values in the table?Put the index down. [Index(IsUnique = true)]) In fact, it should be understood that in the relaying databases, this mechanism is commonly referred to as " delineation " (constraint) and in a specific CBD, the maycroft is restricted to uniqueness (uniqueue constraint) through an index (index, uniqueue index).Just in the model class:public class Customer { public int Id { get; set; } public string Name { get; set; } [Index(IsUnique = true)] public string Email { get; set; } public string Age { get; set; } } If your question of uniqueness is not at the level of individual fields but at the level of email + name, you're a total duplicate: https://ru.stackoverflow.com/q/890442/213987 References: https://docs.microsoft.com/ru-ru/ef/ef6/modeling/code-first/data-annotations#index
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Things to take into account Migrations of Entity Framework 6:Have installed the command console from Entity Framework through the NuGet package: Install-Package Microsoft.EntityFrameworkCore.ToolsYeah. connection chain we have it in a configuration file will take the name and it will pass as a parameter to the base builder of DbContext.Example configuration file<connectionStrings> <add name="BloggingContext" providerName="System.Data.SqlClient" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=PoCBbddCodeFirst;Integrated Security=True" /> </connectionStrings> Example class DbContextpublic class BloggingContext : DbContext { public BloggingContext() : base("name=BloggingContext") { } public DbSet<Blog> Blogs { get; set; } public DbSet<Post> Posts { get; set; } public DbSet<Usuario> Usuarios { get; set; } } By opening the package management console we must make sure you have selected the data layer project as a predetermined project, since in this one will go to search for the classes that inherit from DbContext To start the configuration of the project in the Entity Framework migrations first you have to Enable it. If we want to avoid problems it is recommended to make the data project as "Home Project" at that time, obviously it is not to debug it at that time, but the migration tool will go to search for the connection chains to it and if we do not have them inserted it will not be able to find them. To enable migrations in the project the command is performed Enable-Migrationswhich will create the folder "Migrations" and the file "Configuration.cs"Then create the "scaffolding"from the database using the command: Add-Migration InitialCreate. Bearing in mind that InitialCreate It is a name that we can define to our craving.And finally to pass the migration to the database the command is used Update-Database@DaniGalat the message that gives you usually occurs when you have not selected the predetermined project well for the package management console. On the other hand in the code you show us the only thing that doesn't fit me is the name of the connection (ModelContext) which is different from the one you spend in the builder (DefaultConnection) and I think it can also end up giving you problems.If you end it by solving us out of doubts andmunicate it.
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Good afternoon!I imagine that Person and Athlete are in relationship 1:1 and Code First.Read this article: http://www.entityframeworktutorial.net/code-first/configure-one-to-one-relationship-in-code-first.aspx This site has many articles on EF. But a very important observation is that the ideal is that you use Code-First Convention, which is nothing but nomenclature standard, especially for relational objects, in EF the nomenclature pattern makes a lot of difference. From what I understand there are several things to be done in your code to solve the problem. And all the answers are in the Code-First Convention.Come on.1) For the primary keys of your classes you should name them only as Id Person: public long Id {get;set;} Athlete -> public long Id {get;set;} do not need the annotation date atribute [Key]I suggest you use Guid for your keysIn athlete the property person who is like this:[Required] [ForeignKey("AtletaIdPessoa")] public virtual Pessoa Pessoa { get; set; } It would be like this:public long PessoaId { get; set; } public virtual Pessoa Pessoa { get; set; } Because of the convention, the EF will solve the keys for you.I hope now I could have helped you better if you need more details just talk.
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Because there's no NET. \g<n> It is not possible, as in PCRE, to use the reference to part of the regular expression within the regular expression.It's easier to use. string.Format():var something = "[^<]*"; var regex = new Regex(string.Format(">{0}<.*?>{0}<", something)); Example of the use of structural interpolation:var block = "[^<]*"; var regex = new Regex($@">{block}<.*?>{block}<");
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Be able to be a lot of problems, from its version of Unity to the setup and status of your iOS device.I recommend running Unity's profiler to investigate this problem further. http://docs.unity3d.com/Manual/Profiler.html Effectively for iPhone http://docs.unity3d.com/Manual/iphone-InternalProfiler.html If you cannot follow from these data, I suggest you share more information such as the device model/configuration. And Profiler's results data. And where in your code you call this procedure, it has a big difference you put on Update, FixedUpdate, and by there goes. ♪With a bit of luck it can be something easily resolved in the build configuration. Or add the code Application.targetFrameRate = 60 (Please remember that iOS locks 30 frames per second by default the applications).*Be careful that your question has little information, it is not very specific and many possible answers, able to be blocked by moderation because of it.
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The method Regex.Match will only return the first occurrence of what you found at the entrance. For all results, use the method Regex.Matches, in which all occurrences return.public class Program { public static void Main() { var texto = "if(true) { {{palavra1}} + {{palavra2}}; }"; Regex r = new Regex(@"\{\{[^\}]+?\}\}"); var m = r.Matches(texto); foreach(var match in m) Console.WriteLine(match); } } See working on https://dotnetfiddle.net/QqLjol .Documentation https://docs.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.regex.match?view=netframework-4.8 and https://docs.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.regex.matches?view=netframework-4.8 .
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Optimize the record in the bud. Entity Framework
Software Programming • c sharp entity framework • • emerson

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I only answer the question of optimization. Every time you choose usersFromDb in search of Id. A dictionary should be used for such purposes. Here's the code:Dictionary<int,User> usersFromDb; ... usersFromDb = db.Users.ToDictionary(x=>x.Id, x=>x); ... // Ищем по пользователям из базы if (usersFromDb.ContainsKey(userId)) { var dbUser = usersFromDb[userId]; ... The word allows the search for a constant time O(1). While searching the leaf is taking place at line time O(n).
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Entity Framework DDD Infrastructure Generic
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Entity Framework already implements Repository StandardI've answered that a few times, https://pt.stackoverflow.com/questions/33280/unidade-de-trabalho-unit-of-work-com-reposit%C3%B3rio/33285#33285 , but I will write another answer because for some reason the answer is difficult to locate. https://softwareengineering.stackexchange.com/a/220126/85476 . It is not the answer accepted, but it is the most voted, and it is the one I consider correct. Here it is said that DbContext already implements a Work Unit ( http://martinfowler.com/eaaCatalog/unitOfWork.html ). The Work Unit is the object responsible for implementing the abstraction between your database and the business layer of your application. http://martinfowler.com/eaaCatalog/repository.html .The repository pattern was necessary at a time when object-relational mappers did not exist or were not well developed, which is not the case of the Entity Framework, in which a large part of all bank operations have already been implemented. Among the functions of a repository are:Bring database records already serialized as objects;Persisting objects as records of a database.This all Entity Framework already does, which makes completely unnecessary implement one more layer just to deal with it. In addition to unnecessarily increasing the logic and complexity of your system, the gain with it is zero.But I read in several places that to write tests I need a repository.Yes, because the literature has not been completely renewed. http://www.nogginbox.co.uk/blog/mocking-entity-framework-data-context . I use this directive on some of my projects and I can test the system without escaping DDD.Ah, but I want to implement Join like that. How can I do it?You can use Reflection, find out the complex objects of your Model and carry them within the selection method, which, again I must say, is completely unnecessary. The following construction:var objeto = contexto.Objetos .Include(o => o.ClasseRelacionada1) .Include(o => o.ClasseRelacionada2) .Include(o => o.ColecaoDeClassesRelacionadas1) .Include(o => o.ColecaoDeClassesRelacionadas2) .SingleOrDefault(o => o.ObjetoId == id); You already do that work joins for you.

Nuget Error - Entity Framework

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