如何更新與LINQ集合如果沒有記錄存在，如果存在更新它的屬性

Question

我要添加一個對象集合，但我想知道如何更新它，如果記錄存在，如果norecord存在。

我要在此工作。

public void AssignProductSetting(CategoryType catType, int catId, int freeCount) 
     { 
      this.CustomSettings.Add(new ProductCustomization() 
      { 
       CategoryID = catId, 
       CustomizationType = catType, 
       DefaultFreeCount = freeCount, 
       ProductID = this.ProductID 
      }); 
     } 

Answer 1

if(CustomeSettings == null) CustomerSettings = 
            new Collection<ProductCustomization>(); 

var cat = CustomSettings.FirstOrDefault(r=>r.CategoryId == catID && 
              r.CustomizationType == catType); 
if(cat!=null) 
{ 
    cat.DefaultFreeCount = freeCount; 
    cat.ProductID = this.ProductID; 
} 
else 
{ 
    this.CustomSettings.Add(new ProductCustomization() 
     { 
      CategoryID = catId, 
      CustomizationType = catType, 
      DefaultFreeCount = freeCount, 
      ProductID = this.ProductID 
     }); 
} 

Answer 2

if(this.CustomSettings.Any(x=>x.CategoryID == catId)) 
{ 
    //Update 
} 
else 
{ 
    //Add 
}