Fix method name

RhSolutions.AddIn/AddIn/RhSolutionsFunctions.cs

@@ -152,9 +152,35 @@ public class RhSolutionsFunctions
         }
         else
         {
-            var article = skus.First().Id;
             IDatabaseClient databaseClient = RhSolutionsAddIn.ServiceProvider.GetService<IDatabaseClient>();
             ICurrencyClient currencyClient = RhSolutionsAddIn.ServiceProvider.GetRequiredService<ICurrencyClient>();
+            IMemoryCache memoryCache = RhSolutionsAddIn.ServiceProvider.GetRequiredService<IMemoryCache>();
+            var article = skus.First().Id;
+            DateTime date = dateField == 0 ? DateTime.Today : DateTime.FromOADate(dateField);
+
+            if (!memoryCache.TryGetValue(date, out decimal exchangeRate))
+            {
+                var result = ExcelAsyncUtil.Run(nameof(КУРСЕВРО), dateField, delegate
+                {
+                    var requestResult = currencyClient.GetExchangeRate(date)
+                        .GetAwaiter()
+                        .GetResult();
+
+                    return requestResult ?? -1m;
+                });
+
+                if (result is not decimal)
+                {
+                    return "Загрузка...";
+                }
+                else
+                {
+                    exchangeRate = (decimal)result;
+                    var cacheEntryOptions = new MemoryCacheEntryOptions()
+                        .SetSlidingExpiration(TimeSpan.FromHours(1));
+                    memoryCache.Set(date, exchangeRate, cacheEntryOptions);
+                }
+            }
 
             if (ExcelAsyncUtil.Run(nameof(РЕХАУЦЕНАРУБ), line, delegate
             {
@@ -163,11 +189,6 @@ public class RhSolutionsFunctions
                     .GetResult()
                     .FirstOrDefault();
 
-                DateTime date = dateField == 0 ? DateTime.Today : DateTime.FromOADate(dateField);
-                var exchangeRate = currencyClient.GetCurrencyCourse(date)
-                    .GetAwaiter()
-                    .GetResult();
-
                 return product == null ? -1m :
                     product.Price * exchangeRate * 1.2m;
             }) is not decimal requestResult)
@@ -199,7 +220,7 @@ public class RhSolutionsFunctions
         {
             var result = ExcelAsyncUtil.Run(nameof(КУРСЕВРО), dateField, delegate
             {
-                var requestResult = currencyClient.GetCurrencyCourse(date)
+                var requestResult = currencyClient.GetExchangeRate(date)
                     .GetAwaiter()
                     .GetResult();
 

RhSolutions.AddIn/Services/CurrencyClient.cs

@@ -16,7 +16,7 @@ public class CurrencyClient : ICurrencyClient
         _httpClient = httpClient;
     }
 
-    public async Task<decimal?> GetCurrencyCourse(DateTime date)
+    public async Task<decimal?> GetExchangeRate(DateTime date)
     {
         string request = $"{_requestAddress}{date.Date:dd/MM/yyyy}";
         HttpResponseMessage response = await _httpClient.GetAsync(request);

RhSolutions.AddIn/Services/ICurrencyClient.cs

@@ -5,5 +5,5 @@ namespace RhSolutions.Services;
 
 public interface ICurrencyClient
 {
-    public Task<decimal?> GetCurrencyCourse(DateTime date);
+    public Task<decimal?> GetExchangeRate(DateTime date);
 }