Issue to the line

Question

Issue to the line

Peter_1985 2,846

Hi,

I got the exception like

Exception/StackTrace - Index and length must refer to a location within the string.

how to locate to the place causing the issue.

Viorel 125.7K Reputation points

2025-12-05T07:53:28.5933333+00:00

If the Stack Trace is shown, but does not include the line numbers, then rerun the Debug configuration instead of Release.

Answer accepted by question author

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Your answer

Viorel 125.7K Reputation points

2025-12-05T07:53:28.5933333+00:00

If the Stack Trace is shown, but does not include the line numbers, then rerun the Debug configuration instead of Release.

Answer 1

Thank you for reaching out!
It looks like you're encountering an Index and length must refer to a location within the string exception. This typically happens when you’re trying to access a substring with an invalid index or length that exceeds the actual length of the string.

Here are a few steps you can take to locate the source of this issue:

1. Check String Length: Before you access any substring, ensure the string has enough length. You can do this by checking the length of the string using myString.Length.

2. Use Try-Catch Block: Surround the code with a try-catch block to get more detailed error messages. This can help you identify which part of the code is throwing the error.

   csharp:
try
{
// Your substring logic here
}
catch (ArgumentOutOfRangeException e)
{
   Console.WriteLine($"Error: {e.Message} - {e.StackTrace}");
   }

3. Debugging: If you’re using Visual Studio, use breakpoints to inspect the string values just before you try to access the indices.

4. Code review: Review your LINQ queries or any string manipulation logic to ensure you are not trying to access an out-of-bounds index.

5. Diagnostic Logs: If you're running this in an Azure environment, consider enabling diagnostic logging for your app to capture more detailed information about the error.

References: https://v4.hkg1.meaqua.org/en-us/azure/app-service/troubleshoot-diagnostic-logs -logs https://v4.hkg1.meaqua.org/en-us/dotnet/csharp/how-to/?wt.mc_id=knowledgesearch_inproduct_azure-cx…

Let me know if you need any further help with this. I will be happy to assist. If you find this helpful, Kindly mark the provided solution as "Accept Answer", so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

Susmitha T (INFOSYS LIMITED) 1,790 Reputation points Microsoft External Staff

2025-12-09T05:51:58.2166667+00:00

Hi, hope you’re doing well. We’re following up on this thread to check if the issue is still occurring or has been resolved. If it has been resolved, kindly mark the answer as accepted. We will proceed with thread closure by 11th December.

Looking forward to your response.
Susmitha T (INFOSYS LIMITED) 1,790 Reputation points Microsoft External Staff

2025-12-11T05:08:46.6966667+00:00

Since the thread has been open for a considerable time, we will be proceeding to close the thread. If the issue persists or reoccurs, please feel free to raise a new thread. We’ll be happy to support you further.

Answer 2

To locate the place causing the exception "Index and length must refer to a location within the string," you can utilize the StackTrace property of the exception object. When an exception is thrown, the StackTrace provides a string representation of the immediate frames on the call stack, which can help you trace back to where the error occurred in your code.

Here’s a general approach to handle this:

Catch the Exception: Use a try/catch block around the code that may throw the exception.
Inspect the StackTrace: In the catch block, access the StackTrace property of the caught exception to get detailed information about where the exception occurred.
Debugging: Use the information from the StackTrace to identify the exact line in your code that caused the issue. This will typically include the method name and the line number.

Here’s a simple example:

try
{
    // Code that may throw an exception
}
catch (Exception ex)
{
    Console.WriteLine("Exception Message: " + ex.Message);
    Console.WriteLine("Stack Trace: " + ex.StackTrace);
}

By printing the StackTrace, you can find the exact location in your code where the exception was thrown, which will help you to debug the issue effectively.

References:

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Issue to the line

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