added some c# input examples (#3158)

tutorials/inputs/input_examples.rst

@@ -31,17 +31,34 @@ Examples:
 .. tabs::
  .. code-tab:: gdscript GDScript
 
-    # input event - runs when the input happens
     func _input(event):
         if event.is_action_pressed("jump"):
             jump()
 
-    # polling - runs every frame
     func _physics_process(delta):
         if Input.is_action_pressed("move_right"):
-            # move as long as the key/button is pressed
+            # Move as long as the key/button is pressed.
             position.x += speed * delta
 
+ .. code-tab:: csharp
+
+    public override void _Input(InputEvent inputEvent)
+    {
+        if (inputEvent.IsActionPressed("jump"))
+        {
+            Jump();
+        }
+    }
+
+    public override void _PhysicsProcess(float delta)
+    {
+        if (Input.IsActionPressed("move_right"))
+        {
+            // Move as long as the key/button is pressed.
+            position.x += speed * delta;
+        }
+    }
+
 This gives you the flexibility to mix-and-match the type of input processing
 you do.
 
@@ -64,6 +81,13 @@ attach the following script:
     func _input(event):
         print(event.as_text())
 
+ .. code-tab:: csharp
+
+    public override void _Input(InputEvent inputEvent)
+    {
+        GD.Print(inputEvent.AsText());
+    }
+
 As you press keys, move the mouse, and perform other inputs, you'll see each
 event scroll by in the output window. Here's an example of the output:
 
@@ -102,6 +126,15 @@ avoid this, make sure to test the event type first:
         if event is InputEventMouseButton:
             print("mouse button event at ", event.position)
 
+ .. code-tab:: csharp
+
+    public override void _Input(InputEvent inputEvent)
+    {
+        if (inputEvent is InputEventMouseButton mouseEvent)
+        {
+            GD.Print($"mouse button event at {mouseEvent.Position}");
+        }
+    }
 
 InputMap
 --------
@@ -129,6 +162,16 @@ the action you're looking for:
         if event.is_action_pressed("my_action"):
             print("my_action occurred!")
 
+ .. code-tab:: csharp
+
+    public override void _Input(InputEvent inputEvent)
+    {
+        if (inputEvent.IsActionPressed("my_action"))
+        {
+            GD.Print("my_action occurred!");
+        }
+    }
+
 Keyboard events
 ---------------
 
@@ -145,6 +188,19 @@ the "T" key:
             if event.scancode == KEY_T:
                 print("T was pressed")
 
+ .. code-tab:: csharp
+
+    public override void _Input(InputEvent inputEvent)
+    {
+        if (inputEvent is InputEventKey keyEvent && keyEvent.Pressed)
+        {
+            if ((Keylist)keyEvent.Scancode == KeyList.T)
+            {
+                GD.Print("T was pressed");
+            }
+        }
+    }
+
 .. tip:: See :ref:`@GlobalScope_KeyList <enum_@GlobalScope_KeyList>` for a list of scancode
         constants.
 
@@ -168,6 +224,21 @@ different when it's "Shift+T":
                 else:
                     print("T was pressed")
 
+ .. code-tab:: csharp
+
+    public override void _Input(InputEvent inputEvent)
+    {
+        if (inputEvent is InputEventKey keyEvent && keyEvent.Pressed)
+        {
+            switch ((KeyList)keyEvent.Scancode)
+            {
+                case KeyList.T:
+                    GD.Print(keyEvent.Shift ? "Shift+T was pressed" : "T was pressed");
+                    break;
+            }
+        }
+    }
+
 .. tip:: See :ref:`@GlobalScope_KeyList <enum_@GlobalScope_KeyList>` for a list of scancode
         constants.
 
@@ -198,6 +269,24 @@ also counts as a button - two buttons, to be precise, with both
             if event.button_index == BUTTON_WHEEL_UP and event.pressed:
                 print("Wheel up")
 
+ .. code-tab:: csharp
+
+    public override void _Input(InputEvent inputEvent)
+    {
+        if (inputEvent as InputEventMouseButton mouseEvent && mouseEvent.Pressed)
+        {
+            switch ((ButtonList)mouseEvent.ButtonIndex)
+            {
+                case ButtonList.Left:
+                    GD.Print($"Left button was clicked at {mouseEvent.Position}");
+                    break;
+                case ButtonList.WheelUp:
+                    GD.Print("Wheel up");
+                    break;
+            }
+        }
+    }
+
 Mouse motion
 ~~~~~~~~~~~~
 
@@ -230,6 +319,38 @@ node:
             # While dragging, move the sprite with the mouse.
             $Sprite.position = event.position
 
+ .. code-tab:: csharp
+
+    public override void _Input(InputEvent inputEvent)
+    {
+        var sprite = GetNodeOrNull<Sprite>("Sprite");
+        if (sprite == null)
+            return;// No suitable node was found.
+
+        if (inputEvent is InputEventMouseButton mouseEvent && (ButtonList)mouseEvent.ButtonIndex == ButtonList.Left)
+        {
+            if ((mouseEvent.Position - sprite.Position).Length() < clickRadius)
+            {
+                // Start dragging if the click is on the sprite.
+                if (!dragging && mouseEvent.Pressed)
+                    dragging = !dragging;
+            }
+            // Stop dragging if the button is released.
+            if (dragging && !mouseEvent.Pressed)
+            {
+                dragging = false;
+            }
+        }
+        else
+        {
+            if (inputEvent is InputEventMouseMotion motionEvent)
+            {
+                // While dragging, move the sprite with the mouse.
+                sprite.Position = motionEvent.Position;
+            }
+        }
+    }
+
 Touch events
 ------------