message error CS1525

Question

Hi,

I would like to put a specific value in table when I click on add bouton

class model

public partial class Developer  
{  
        public int Id { get; set; }  
        public string ECR { get; set; }  
        public DateTime DateCrea { get; set; }  
       
 }  

razor page
<div class="col-md-6">
<RadzenTextBox style="width: 100%;" Name="Numéro ECR" @bind-Value=IncrementECR() >
</RadzenTextBox>
<ValidationMessage For="@(() => dev.ECR)" />
</div>

@code {  
    [Parameter] public Developer dev { get; set; }  
  
    private readonly int _currentYear = DateTime.Today.Year;      
  
    public void IncrementECR()  
    {  
        int datecrea = dev.DateCrea.Year;  
  
        if(datecrea == _currentYear)  
        {  
           @dev.ECR = 001 + "/" + _currentYear;                        
             
        }     
    }  
}  

I received the message that I don't understand : the invalid '=' expression term
because I want to assign a value to @dev.ECR and not compare with '=='

FYI, I used the several source to create my application, I list below the different links
blazor-crud-with-entity-framework-core
blazor-api-handling
dashboard

Answer 1

The C# syntax is...

dev.ECR = "001" + "/" + _currentYear.ToString();   

The @ is used in Razor markup to transistion between C# and HTML. The @ is used in C# to define a literal string or use a verbatim identifier.

I would use string interpolation though.

dev.ECR = $"001/{_currentYear}";  

Please see the C# programming guide.

String interpolation in C#
@ (C# Reference)
Razor syntax reference for ASP.NET Core

Keep in mind, Radzen is a 3rd party framework. Radzen is a better support option for Radzen element questions.

Answer 2

Thanks to your reply. FYI, I use only the radzen library for my UI this means I don't use the radzen to build my application.

I no longer have the CS1525 error but now I get the following message : 'FormCreate.IncrementECR()' : not all paths in the code return a value; why?

  <div class="col-md-6">  
                        <RadzenTextBox style="width: 100%;" Name="Numéro ECR" @bind-Value=@IncrementECR()>  
                        </RadzenTextBox>     
                        <ValidationMessage For="@(() => dev.ECR)" />  
                    </div>  

    @code{  
    private readonly int _currentYear = DateTime.Today.Year;      
  
    private string IncrementECR()  
    {  
        int datecrea = dev.DateCrea.Year;  
  
        if(datecrea == _currentYear)  
        {  
             
            return dev.ECR= $"001/{_currentYear}";  
        }         
    }  
    }  

   

Answer 3

I no longer have the CS1525 error but now I get the following message : 'FormCreate.IncrementECR()' : not all paths in the code return a value; why?

Your original question has been answered. It is customary to mark the post as answered and ask a new question.

Unfortunately we have no idea what you are thinking. What do want to return when datacrea does not equal _currentYear?

Something like this?

 private string IncrementECR()  
 {  
     int datecrea = dev.DateCrea.Year;  
  
     if(datecrea == _currentYear)  
     {      
         return dev.ECR= $"001/{_currentYear}";  
     }       
     return return dev.ECR;  
 }  

Anyway, I would rethink the design and place this logic in the Developer class.

Answer 4

as I said in my first post I would like to put a specific value in a cell of the ECR column when I click on the Add ECR button.

The structure of my application is as follow :

Fetch.razor where there is a button Add ECR

<div class="form-group">  
    <a class="btn btn-primary" href="developer/create">Add ECR</a>  
</div>  

developer/create

@page "/developer/create"  
@inject HttpClient http  
  
@inject NavigationManager uriHelper  
  
<FormCreate ButtonText="Create Developer" dev="@dev"  
            OnValidSubmit="@CreateDeveloper"/>  
  
@code {  
    Developer dev = new Developer();  
  
    async Task CreateDeveloper()  
    {  
        await http.PostAsJsonAsync("api/developer", dev);  
        uriHelper.NavigateTo("developer");  
    }  
  
}  

FormCreate.razor

<EditForm Model="@dev" OnValidSubmit="@OnValidSubmit">  
    <DataAnnotationsValidator />  
  
  <RadzenFieldset Text="Creation ECR">  
                <div class="row">  
                    <div class="col-md-4 align-items-center d-flex">  
                        <RadzenLabel Text="Numéro ECR" />  
                    </div>  
                    <div class="col-md-6">  
                        <RadzenTextBox style="width: 100%;" Name="Numéro ECR" @bind-Value=@IncrementECR()>  
                        </RadzenTextBox>     
                        <ValidationMessage For="@(() => dev.ECR)" />  
                    </div>  
                </div>  
...  
     </RadzenFieldset>  
</EditForm>  

when I click on Add ECR I would like to fill the TexBox with the specifier value eg 001/22. Each time I click on Add ECR this value is incremented 001/22; 002/22; ...100/22...
When the year change (eg 2023) I want to initialize the value at 001/23...

Answer 5

why you would put the number in a text input.

I want to put a specific value which takes a form "001/22" which will be a string value.

The code to add number increment

       private readonly int _currentYear = DateTime.Today.Year;      
       int counter = 0;  
      private string IncrementECR()  
      {              
             dev.ECR = counter.ToString("00") + "/" + _currentYear.ToString();  
           counter++;  

            return dev.ECR ;  
            
      }  

But there are always the message cs1525