Application settings based custom application name and table name

.gitignore

@@ -3,3 +3,4 @@
 *.user
 obj/
 bin/
+.vs/

README.md

@@ -46,9 +46,23 @@ Isolate per application in a single Elmah store
     <errorLog type="Elmah.AzureTableStorage.AzureTableStorageErrorLog, Elmah.AzureTableStorage" 
         connectionString="UseDevelopmentStorage=true" applicationName="MyApp" />
 
+By application setting:
+
+    <errorLog type="Elmah.AzureTableStorage.AzureTableStorageErrorLog, Elmah.AzureTableStorage" 
+        connectionString="UseDevelopmentStorage=true" applicationNameAppKey="ApplicationName" />
+
+Make sure you add an element under the `appSettings` element.
+
 ### Table Name
 
 Set a custom table name (defaults to "Elmah"):
 
     <errorLog type="Elmah.AzureTableStorage.AzureTableStorageErrorLog, Elmah.AzureTableStorage" 
         connectionString="UseDevelopmentStorage=true" tableName="MyCustomElmahTable" />
+
+By application setting:
+
+    <errorLog type="Elmah.AzureTableStorage.AzureTableStorageErrorLog, Elmah.AzureTableStorage" 
+        connectionString="UseDevelopmentStorage=true" tableNameAppKey="ElmahTableName" />
+
+Make sure you add an element under the `appSettings` element.

src/Elmah.AzureTableStorage/AzureTableStorageErrorLog.cs

@@ -44,9 +44,11 @@ public AzureTableStorageErrorLog(IDictionary config)
             // Get custom table name for storage and validate
             //
 
-            var tableName = config.Find("tableName", DefaultTableName);
+            var tableName = ElmahHelper.GetTableName(config);
+            if (tableName.Length == 0)
+                tableName = DefaultTableName;
 
-            if(!Regex.IsMatch(tableName, TableValidationRegex))
+            if (!Regex.IsMatch(tableName, TableValidationRegex))
                 throw new ApplicationException("Name for table in Azure Table Storage is not a valid name.");
 
             var cloudStorageAccount = CloudStorageAccount.Parse(connectionString);
@@ -59,7 +61,7 @@ public AzureTableStorageErrorLog(IDictionary config)
             // per-application isolation over a single store.
             //
 
-            var appName = config.Find("applicationName", string.Empty);
+            var appName = ElmahHelper.GetApplicationName(config);
 
             if (appName.Length > MaxAppNameLength)
             {

src/Elmah.AzureTableStorage/ElmahHelper.cs

@@ -57,5 +57,45 @@ public static string GetConnectionString(IDictionary config)
                  ? CloudConfigurationManager.GetSetting(connectionStringAppKey)
                  : string.Empty;
         }
+
+        public static string GetApplicationName(IDictionary config)
+        {
+            // Check for application name
+            var applicationName = config.Find("applicationName", string.Empty);
+            if (applicationName.Length > 0)
+                return applicationName;
+
+            // If not found then check for <appSettings> Key
+            var applicationNameAppKey = config.Find("applicationNameAppKey", string.Empty);
+            if (applicationNameAppKey.Length > 0)
+            {
+                applicationName = CloudConfigurationManager.GetSetting(applicationNameAppKey);
+
+                if (applicationName == null)
+                    return string.Empty;
+            }
+
+            return applicationName;
+        }
+
+        public static string GetTableName(IDictionary config)
+        {
+            // Check for table name
+            var tableName = config.Find("tableName", string.Empty);
+            if (tableName.Length > 0)
+                return tableName;
+
+            // If not found then check for <appSettings> Key
+            var tableNameAppKey = config.Find("tableNameAppKey", string.Empty);
+            if (tableNameAppKey.Length > 0)
+            {
+                tableName = CloudConfigurationManager.GetSetting(tableNameAppKey);
+
+                if (tableName == null)
+                    return string.Empty;
+            }
+
+            return tableName;
+        }
     }
 }