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108 lines
2.5 KiB
108 lines
2.5 KiB
---
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sidebar_position: 2
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title: Changing the data service
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---
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In order to take into account the modification of an element, we will first add the following functionalities to our data service:
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* Retrieve an item by its identifier
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* Update an item
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## Add the methods to the interface
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Open the `Services/IDataService.cs` file and add the highlighted items:
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```csharp title="Services/IDataService.cs"
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public interface IDataService
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{
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Task Add(ItemModel model);
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Task<int> Count();
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Task<List<Item>> List(int currentPage, int pageSize);
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// highlight-start
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Task<Item> GetById(int id);
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Task Update(int id, ItemModel model);
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// highlight-end
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}
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```
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## Add the methods to the implementation
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Open the `Services/DataLocalService.cs` file and add the following methods:
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```csharp title="Services/DataLocalService.cs"
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...
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public async Task<Item> GetById(int id)
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{
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// Get the current data
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var currentData = await _localStorage.GetItemAsync<List<Item>>("data");
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// Get the item int the list
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var item = currentData.FirstOrDefault(w => w.Id == id);
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// Check if item exist
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if (item == null)
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{
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throw new Exception($"Unable to found the item with ID: {id}");
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}
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return item;
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}
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public async Task Update(int id, ItemModel model)
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{
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// Get the current data
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var currentData = await _localStorage.GetItemAsync<List<Item>>("data");
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// Get the item int the list
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var item = currentData.FirstOrDefault(w => w.Id == id);
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// Check if item exist
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if (item == null)
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{
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throw new Exception($"Unable to found the item with ID: {id}");
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}
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// Save the image
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var imagePathInfo = new DirectoryInfo($"{_webHostEnvironment.WebRootPath}/images");
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// Check if the folder "images" exist
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if (!imagePathInfo.Exists)
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{
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imagePathInfo.Create();
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}
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// Delete the previous image
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if (item.Name != model.Name)
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{
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var oldFileName = new FileInfo($"{imagePathInfo}/{item.Name}.png");
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if (oldFileName.Exists)
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{
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File.Delete(oldFileName.FullName);
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}
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}
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// Determine the image name
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var fileName = new FileInfo($"{imagePathInfo}/{model.Name}.png");
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// Write the file content
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await File.WriteAllBytesAsync(fileName.FullName, model.ImageContent);
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// Modify the content of the item
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item.DisplayName = model.DisplayName;
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item.Name = model.Name;
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item.RepairWith = model.RepairWith;
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item.EnchantCategories = model.EnchantCategories;
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item.MaxDurability = model.MaxDurability;
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item.StackSize = model.StackSize;
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item.UpdatedDate = DateTime.Now;
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// Save the data
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await _localStorage.SetItemAsync("data", currentData);
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}
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``` |