Add Type field for Variables.

src/PowerShellEditorServices.Protocol/DebugAdapter/Variable.cs

@@ -12,6 +12,11 @@ public class Variable
 		// /** The variable's value. For structured objects this can be a multi line text, e.g. for a function the body of a function. */
         public string Value { get; set; }
 
+        /// <summary>
+        /// Gets or sets the type of the variable's value. Typically shown in the UI when hovering over the value.
+        /// </summary>
+        public string Type { get; set; }
+
         /// <summary>
         /// Gets or sets the evaluatable name for the variable that will be evaluated by the debugger.
         /// </summary>
@@ -26,6 +31,7 @@ public static Variable Create(VariableDetailsBase variable)
             {
                 Name = variable.Name,
                 Value = variable.ValueString ?? string.Empty,
+                Type = variable.Type,
                 EvaluateName = variable.Name,
                 VariablesReference = 
                     variable.IsExpandable ?

src/PowerShellEditorServices/Debugging/DebugService.cs

@@ -363,6 +363,12 @@ public VariableDetailsBase[] GetVariables(int variableReferenceId)
         {
             VariableDetailsBase[] childVariables;
 
+            if ((variableReferenceId < 0) || (variableReferenceId >= this.variables.Count))
+            {
+                logger.Write(LogLevel.Warning, $"Received request for variableReferenceId {variableReferenceId} that is out of range of valid indices.");
+                return new VariableDetailsBase[0];
+            }
+
             VariableDetailsBase parentVariable = this.variables[variableReferenceId];
             if (parentVariable.IsExpandable)
             {

src/PowerShellEditorServices/Debugging/VariableDetails.cs

@@ -87,7 +87,10 @@ public VariableDetails(string name, object value)
             this.Id = -1; // Not been assigned a variable reference id yet
             this.Name = name;
             this.IsExpandable = GetIsExpandable(value);
-            this.ValueString = GetValueString(value, this.IsExpandable);
+
+            string typeName;
+            this.ValueString = GetValueStringAndType(value, this.IsExpandable, out typeName);
+            this.Type = typeName;
         }
 
         #endregion
@@ -154,23 +157,27 @@ private static bool GetIsExpandable(object valueObject)
                 !(valueObject is UnableToRetrievePropertyMessage);
         }
 
-        private static string GetValueString(object value, bool isExpandable)
+        private static string GetValueStringAndType(object value, bool isExpandable, out string typeName)
         {
-            string valueString;
+            string valueString = null;
+            typeName = null;
 
             if (value == null)
             {
                 // Set to identifier recognized by PowerShell to make setVariable from the debug UI more natural.
-                valueString = "$null";
+                return "$null";
             }
-            else if (value is bool)
+
+            Type objType = value.GetType();
+            typeName = $"[{objType.FullName}]";
+
+            if (value is bool)
             {
                 // Set to identifier recognized by PowerShell to make setVariable from the debug UI more natural.
                 valueString = (bool) value ? "$true" : "$false";
             }
             else if (isExpandable)
             {
-                Type objType = value.GetType();
 
                 // Get the "value" for an expandable object.
                 if (value is DictionaryEntry)
@@ -181,12 +188,11 @@ private static string GetValueString(object value, bool isExpandable)
                         string.Format(
                             "[{0}, {1}]",
                             entry.Key,
-                            GetValueString(entry.Value, GetIsExpandable(entry.Value)));
+                            GetValueStringAndType(entry.Value, GetIsExpandable(entry.Value), out typeName));
                 }
                 else
                 {
                     string valueToString = value.SafeToString();
-
                     if (valueToString.Equals(objType.ToString()))
                     {
                         // If the ToString() matches the type name, then display the type
@@ -208,7 +214,7 @@ private static string GetValueString(object value, bool isExpandable)
                             shortTypeName = InsertDimensionSize(shortTypeName, collection.Count);
                         }
 
-                        valueString = "[" + shortTypeName + "]";
+                        valueString = $"[{shortTypeName}]";
                     }
                     else
                     {

src/PowerShellEditorServices/Debugging/VariableDetailsBase.cs

@@ -38,6 +38,11 @@ public abstract class VariableDetailsBase
         /// </summary>
         public string ValueString { get; protected set; }
 
+        /// <summary>
+        /// Gets the type of the variable's value.
+        /// </summary>
+        public string Type { get; protected set; }
+
         /// <summary>
         /// Returns true if the variable's value is expandable, meaning
         /// that it has child properties or its contents can be enumerated.