Add SetJobData method to support persisting job data to PerformContext.

Author: icsharp

src/Hangfire.RecurringJobExtensions/Configuration/FileConfigurationProvider.cs

@@ -84,20 +84,9 @@ private void OnChanged(object sender, FileSystemEventArgs e)
 
 		private ExtendedDataJobFilter FindServerFilter()
 		{
-			ExtendedDataJobFilter filter = null;
+			var jobFilter = GlobalJobFilters.Filters.FirstOrDefault(x => x.Instance.GetType() == typeof(ExtendedDataJobFilter));
 
-			var enumerator = GlobalJobFilters.Filters.GetEnumerator();
-
-			while (enumerator.MoveNext())
-			{
-				if (enumerator.Current.Instance.GetType() == typeof(ExtendedDataJobFilter))
-				{
-					filter = enumerator.Current.Instance as ExtendedDataJobFilter;
-					break;
-				}
-			}
-
-			return filter;
+			return jobFilter.Instance as ExtendedDataJobFilter;
 		}
 
 		/// <summary>

src/Hangfire.RecurringJobExtensions/ExtendedDataJobFilter.cs

@@ -41,13 +41,11 @@ public void OnPerforming(PerformingContext filterContext)
 
 			var jobInfo = RecurringJobInfos[filterContext.BackgroundJob.Job.ToString()];
 
-			if (jobInfo == null
-				|| jobInfo.ExtendedData == null
-				|| jobInfo.ExtendedData.Count == 0) return;
+			if (jobInfo == null) return;
 
 			var jobDataKey = $"recurringjob-info-{jobInfo.ToString()}";
 
-			filterContext.Items[jobDataKey] = jobInfo.ExtendedData;
+			filterContext.Items[jobDataKey] = jobInfo.ExtendedData ?? new Dictionary<string, object>();
 		}
 		/// <summary>
 		/// Called after the performance of the job.

src/Hangfire.RecurringJobExtensions/PerformContextExtensions.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Hangfire.Common;
 using Hangfire.Server;
 
@@ -47,5 +48,26 @@ public static T GetJobData<T>(this PerformContext context, string name)
 
 			return JobHelper.FromJson<T>(json);
 		}
+		/// <summary>
+		/// Persists job data to <see cref="PerformContext"/>.
+		/// </summary>
+		/// <param name="context">The <see cref="PerformContext"/>.</param>
+		/// <param name="name">The dictionary key from the property <see cref="RecurringJobInfo.ExtendedData"/></param>
+		/// <param name="value">The persisting value.</param>
+		public static void SetJobData(this PerformContext context, string name, object value)
+		{
+			if (string.IsNullOrEmpty(name)) throw new ArgumentNullException(nameof(name));
+
+			var jobDataKey = $"recurringjob-info-{context.BackgroundJob.Job.ToString()}";
+
+			if (!context.Items.ContainsKey(jobDataKey))
+				throw new KeyNotFoundException($"The job data key: {jobDataKey} is not found.");
+
+			var jobData = context.Items[jobDataKey] as IDictionary<string, object>;
+
+			if (jobData == null) jobData = new Dictionary<string, object>();
+
+			jobData[name] = value;
+		}
 	}
 }