Fixed datetime conversion when writing

Author: dei79

CoreHelpers.WindowsAzure.Storage.Table.Tests/ITS016ExportToJson.cs

@@ -1,4 +1,4 @@
-using System.Text;
+using System.Text;
 using CoreHelpers.WindowsAzure.Storage.Table.Tests.Contracts;
 using CoreHelpers.WindowsAzure.Storage.Table.Tests.Extensions;
 using CoreHelpers.WindowsAzure.Storage.Table.Tests.Models;
@@ -32,7 +32,7 @@ public async Task VerifyExportToJson()
                 storageContext.AddAttributeMapper(typeof(DemoModel2), tableName1);
 
                 // create model with data in list
-                var model = new DemoModel2() { P = "1", R = "2" };
+                var model = new DemoModel2() { P = "1", R = "2", CreatedAt = DateTime.Parse("2023-11-10T19:09:50.065462+00:00").ToUniversalTime()};
 
                 // inser the model                    
                 await storageContext.EnableAutoCreateTable().MergeOrInsertAsync<DemoModel2>(new List<DemoModel2>() { model });
@@ -46,7 +46,7 @@ public async Task VerifyExportToJson()
 
                 // verify the targetstream
                 var parsedStream = Encoding.Default.GetString(targetStream.GetBuffer()).Split("\0")[0];
-                var expectedStreamValue = "[{\"RowKey\":\"2\",\"PartitionKey\":\"1\",\"Properties\":[{\"PropertyName\":\"P\",\"PropertyType\":0,\"PropertyValue\":\"1\"},{\"PropertyName\":\"R\",\"PropertyType\":0,\"PropertyValue\":\"2\"}]}]";
+                var expectedStreamValue = "[{\"RowKey\":\"2\",\"PartitionKey\":\"1\",\"Properties\":[{\"PropertyName\":\"CreatedAt\",\"PropertyType\":3,\"PropertyValue\":\"2023-11-10T19:09:50.065462+00:00\"},{\"PropertyName\":\"P\",\"PropertyType\":0,\"PropertyValue\":\"1\"},{\"PropertyName\":\"R\",\"PropertyType\":0,\"PropertyValue\":\"2\"}]}]";
                 Assert.Equal(expectedStreamValue, parsedStream);
 
                 // drop table

CoreHelpers.WindowsAzure.Storage.Table.Tests/Models/DemoModel2.cs

@@ -13,7 +13,7 @@ public class DemoModel2
         [RowKey]
         public string R { get; set; } = "R1";
 
-        public DateTime CreatedAt { get; set; } = DateTime.MinValue;
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
     }
 }
 

CoreHelpers.WindowsAzure.Storage.Table/StorageContextImportExport.cs

@@ -67,7 +67,7 @@ public async Task ExportToJsonAsync(string tableName, TextWriter writer, Action<
                             switch (propertyKvp.Value.GetType().GetEdmPropertyType())
                             {
                                 case ExportEdmType.DateTime:
-                                    wr.WriteValue(((DateTime)propertyKvp.Value).ToUniversalTime());
+                                    wr.WriteValue(((DateTimeOffset)propertyKvp.Value).ToUniversalTime());
                                     break;
                                 default:
                                     wr.WriteValue(propertyKvp.Value);