Change the default warning message of CmdletPreviewAttribute and allow setting ETA

Author: BethanyZhou

src/Common/AzurePSCmdlet.cs

@@ -378,7 +378,7 @@ private void WriteBreakingChangeOrPreviewMessage()
                 && configManager.GetConfigValue<bool>(ConfigKeysForCommon.DisplayBreakingChangeWarning))
             {
                 BreakingChangeAttributeHelper.ProcessCustomAttributesAtRuntime(this.GetType(), this.MyInvocation, WriteWarning);
-                PreviewAttributeHelper.ProcessCustomAttributesAtRuntime(this.GetType(), this.MyInvocation, WriteDebug);
+                PreviewAttributeHelper.ProcessCustomAttributesAtRuntime(this.GetType(), this.MyInvocation, WriteWarning);
             }
         }
 

src/Common/Common.csproj

@@ -41,7 +41,7 @@
 
   <ItemGroup>
     <Compile Update="Properties\Resources.Designer.cs">
-      <DesignTime>true</DesignTime>
+      <DesignTime>True</DesignTime>
       <AutoGen>true</AutoGen>
       <DependentUpon>Resources.resx</DependentUpon>
     </Compile>

src/Common/CustomAttributes/CmdletPreviewAttribute.cs

@@ -14,6 +14,7 @@
 
 using Microsoft.WindowsAzure.Commands.Common.Properties;
 using System;
+using System.Globalization;
 using System.Management.Automation;
 
 namespace Microsoft.WindowsAzure.Commands.Common.CustomAttributes
@@ -25,6 +26,10 @@ public class CmdletPreviewAttribute : System.Attribute
     {
         public string _message;
 
+        public DateTime EstimatedGaDate { get; }
+
+        public bool IsEstimatedGaDateSet { get; } = false;
+
         public CmdletPreviewAttribute()
         {
             this._message = Resources.PreviewCmdletMessage;
@@ -35,9 +40,27 @@ public CmdletPreviewAttribute(string message)
             this._message = message;
         }
 
+
+        public CmdletPreviewAttribute(string message, string estimatedDateOfGa)
+        {
+            this._message = message;
+
+
+            if (DateTime.TryParse(estimatedDateOfGa, new CultureInfo("en-US"), DateTimeStyles.None, out DateTime result))
+            {
+                this.EstimatedGaDate = result;
+                this.IsEstimatedGaDateSet = true;
+            }
+
+        }
+
         public void PrintCustomAttributeInfo(Action<string> writeOutput)
         {
             writeOutput(this._message);
+            if (IsEstimatedGaDateSet)
+            {
+                writeOutput(string.Format(Resources.PreviewCmdletETAMessage, this.EstimatedGaDate));
+            }
         }
 
         public virtual bool IsApplicableToInvocation(InvocationInfo invocation)