Question

I have the following code:

List<ProductGroupProductData> productGroupProductDataList = FillMyList();
string[] excludeProductIDs = { "871236", "283462", "897264" };
int count = productGroupProductDataList.Count;

for (int removeItemIndex = 0; removeItemIndex < count; removeItemIndex++)
{
   if (excludeProductIDs.Contains(productGroupProductDataList[removeItemIndex].ProductId))
   {
       productGroupProductDataList.RemoveAt(removeItemIndex);
       count--;
   }
}

Now i want to do the same with linq. Is there any way for this?

The second thing would be, to edit each List-Item property with linq.

Answer 1

Firstly corrected version of your current code that won’t skip entries

List<ProductGroupProductData> productGroupProductDataList = FillMyList(); 
string[] excludeProductIDs = { "871236", "283462", "897264" }; 
int count = productGroupProductDataList.Count; 

for (int removeItemIndex = 0; removeItemIndex < count; removeItemIndex++) 
{ 
   while (removeItemIndex < count && excludeProductIDs.Contains(productGroupProductDataList[removeItemIndex].ProductId))  {
       productGroupProductDataList.RemoveAt(removeItemIndex); 
       count--; 
     }
   } 
} 

This linq code would do the job.

List<ProductGroupProductData> productGroupProductDataList = FillMyList();  
string[] excludeProductIDs = { "871236", "283462", "897264" };  
productGroupProductDataList=productGroupProductDataList.Where(x=>!excludedProductIDs.Contains(x.ProductId)).ToList();

Alternatively using paolo’s answer of remove all the last line would be would be

productGroupProductDataList.RemoveAll(p=>excludedProductIDs.Contains(p=>p.ProductId));

What you mean by “The second thing would be, to edit each List-Item property with linq.”?