How to fix this " Error There was an error running the selected code generator: 'startIndex cannot be larger than length of string. (Parameter 'startIndex')' "

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How to fix this " Error There was an error running the selected code generator: 'startIndex cannot be larger than length of string. (Parameter 'startIndex')' "

NADA KETMEK 0

Hello I got this error issue. When I tried to create New Scaffolded Item > Selected ' MVC Controller with views, using Entity Frame Work

I use Microsoft Entity Frame work version 8.0.8 Version and the Frame Work Design I use 8.05
Window 11 Net 8.0
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Anonymous

Hi @NADA KETMEK,

After testing in my local, we can't reproduce the issue. So could you share your Model_Name.cs file with us.

This is my test mode class, it works for me.

using Microsoft.EntityFrameworkCore;
using System.ComponentModel.DataAnnotations;
namespace WebApplication2.Models
{
    public class TestModel
    {
        [Key]
        public int Id { get; set; }
        public Guid Guid { get; set; }
        public string? Name { get; set; }
    }
}

Best Regards

Jason

NADA KETMEK 0 Reputation points

2024-09-26T08:24:58.0333333+00:00

Hello I decided to send My File to my friends and Ask They to Create The New Scaffolded Item And they can Create the Scaffolded and No Error like Error There was an error running the selected code generator: 'startIndex cannot be larger than length of string. (Parameter 'startIndex')'

So I think Is it's because i use window 11 or not?

Best Regards <3
Anonymous

2024-09-26T08:29:35.91+00:00

Hi @NADA KETMEK,

In my side, I am using windows 11 and it works fine. Could you uninstall and re-install vs2022 ? And try again.

Best Regards

Jason
NADA KETMEK 0 Reputation points

2024-09-26T09:58:42.8566667+00:00

it's not work sir.

Best Regards
Anonymous

2024-09-27T07:56:27.77+00:00

Hi @NADA KETMEK,

May I know your environment ? Something like : windows os version, vs2022 version and sdk version.

Best Regards

Jason

3 answers

Your answer

Anonymous

2024-09-25T06:58:49.4666667+00:00

Hi @NADA KETMEK,

After testing in my local, we can't reproduce the issue. So could you share your Model_Name.cs file with us.

This is my test mode class, it works for me.

using Microsoft.EntityFrameworkCore; using System.ComponentModel.DataAnnotations; namespace WebApplication2.Models { public class TestModel { [Key] public int Id { get; set; } public Guid Guid { get; set; } public string? Name { get; set; } } }

Best Regards

Jason
NADA KETMEK 0 Reputation points

2024-09-26T08:24:58.0333333+00:00

Hello I decided to send My File to my friends and Ask They to Create The New Scaffolded Item And they can Create the Scaffolded and No Error like Error There was an error running the selected code generator: 'startIndex cannot be larger than length of string. (Parameter 'startIndex')'

So I think Is it's because i use window 11 or not?

Best Regards <3
Anonymous

2024-09-26T08:29:35.91+00:00

Hi @NADA KETMEK,

In my side, I am using windows 11 and it works fine. Could you uninstall and re-install vs2022 ? And try again.

Best Regards

Jason
NADA KETMEK 0 Reputation points

2024-09-26T09:58:42.8566667+00:00

it's not work sir.

Best Regards
Anonymous

2024-09-27T07:56:27.77+00:00

Hi @NADA KETMEK,

May I know your environment ? Something like : windows os version, vs2022 version and sdk version.

Best Regards

Jason

Answer 1

youzeliang 895

This error typically occurs when there’s an issue with the input parameters in the scaffolding process, often related to the model or context. To troubleshoot, try the following:

Check Your Model: Ensure that your model and its properties are correctly defined, with no null or empty strings that could be causing the issue.

Update Packages: Make sure all your NuGet packages are up to date, especially Entity Framework.

Clean and Rebuild: Clean the solution and rebuild it to clear any cached issues.

Visual Studio Restart: Sometimes simply restarting Visual Studio can resolve temporary glitches.

If the issue persists, could you provide more details about your model or the specific context you’re using?

If my answer is helpful to you, you can accept it. Thank you.

NADA KETMEK 0 Reputation points

2024-09-26T08:29:56.13+00:00

Hello Thank you for the answer

I use to this solution but it's dose not work

So i decided to ask my friends who use Window 10 to Create the MVC controller and They didn't have this error

Is it's because I use window 11? or Something

Best Regards

Answer 2

SurferOnWww 4,631

Please try the following Microsoft tutorial up to Part 4 and confirm if the scaffolding operation has been properly done according to the section Scaffold movie pages in Part 4:

Answer 3

SurferOnWww 4,631

deleted as duplicated

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How to fix this " Error There was an error running the selected code generator: 'startIndex cannot be larger than length of string. (Parameter 'startIndex')' "

3 answers

Your answer