Why Does an IndexOutOfRangeException Occur in C#?

Innexoutofrangexception in the c#

IndexoutoFRANGEEXCEPTION occurs when trying to access the array or set the element of the effective index range in the collection. This means that the index you use is lower than the upper boundary of the lower bound or higher than (or equal) collection. The timing of abnormal occurrence

Consider a array called

, size 4:

access index 0 to 3 is valid, but trying to access

will trigger indexoutofrangexception abnormalities. array

The reasons and solutions

<code class="language-csharp">byte[] array = new byte[4];</code>

array[4] <.> 1. The length of the array

The array is based on 0, so the index of the first element is 0, and the index of the last element is length -1.

Avoid using index access elements equal to Length, such as .

<.> 2. The upper bounds are not included in the inside
• array[array.Length] = 0; Array index does not include the upper bounds.

For example, the image from (0, 0) to (imageswidth -1, imageheight -1) should not be used by

access.

<.> 3. The array will not automatically grow

• The array is designed to be fast, but the size cannot be adjusted. pixels[imageWidth, imageHeight]
Use to increase the size of the array, but please remember that the effective index range is from 0 to length -1.

<.> 4. Customized array boundary

• Arrays can have a custom lower boundary.
• Ensure that your calculations and boundaries are correct, as the index outside the interview will cause abnormalities. Array.Resize<T>()

<.> 5. Invalid parameters

Verify parameters entering or passed to the function to prevent access to indexes beyond the range.

<.> 6. Accident results

The search function may return -1 to the unusual items. Treatment of these situations to avoid abnormalities in subsequent array access.

• <.> 7. IdataReader and column

When accessing data from the database with IDAREADER, make sure to provide effective column indexes.

<.> 8. DataViewsort
Make sure the column name specifies for DataViewsort is valid.

How to avoid

• Verify parameters and array boundary before accessing elements.

Treatment of the potential problem of the search function returned -1.

Use or object state verification to ensure the correct prerequisite.

How to debug

Check the stack tracking to determine the line of abnormalities. Check the relevant array and indexes to ensure that they are within the effective range.

Use the debugger to gradually execute the code and monitor the value of the variable.

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