How to solve the issue of slow row creation in c# npoi?

If the speed of creating rows in C# with NPOI is slow, you can try the following methods to optimize it:

1. Utilize batch writing: Instead of writing data to file immediately after creating each row, it is recommended to store the data in memory and write to the file all at once after accumulating a certain amount of data. This can reduce frequent disk operations and improve writing speed.
2. Using caching: You can use caching to store previously created rows instead of creating them again each time. When a new row needs to be created, first check if there is a available row in the cache, if so, use it directly; if not, create a new row and add it to the cache.
3. Using multithreading: consider utilizing multiple threads to concurrently create rows, increasing the creation speed. Tasks of creating rows can be assigned to multiple threads to execute in parallel, and then merge the results into one file.
4. Using memory-mapping files: Memory-mapping files can directly map the content of a file into memory, avoiding frequent disk read and write operations, thereby improving read and write speeds.
5. Consider using other Excel operation libraries: If NPOI is not meeting the speed requirement in creating rows, think about using other more efficient Excel operation libraries such as EPPlus or Aspose.Cells.

Please note that the above methods are some common optimization techniques. Specific optimization strategies should be adjusted and tested based on the individual situation in order to find the most suitable solution.