Using a dynamic keyword in .Net 3.5

Question

I wrote this code in visual studio 2013 using .net v4.5. The problem I am facing is that I now need to go down to .net v3.5 and the dynamic keyword throws an error because there is no link to the assembly. Is there an equivalent type for "dynamic" in .net v3.5 or for me to achieve the same results as below?

I thought I found our answer here , but var throws errors when I add .Attributes or .Text modifiers.

private void CreateControl<T>(string objText,
                              Panel pnl,
                              string HTMLTag = "<td>",
                              string applicantID = "",
                              EventHandler hndl = null)
{
    pnl.Controls.Add(new LiteralControl(HTMLTag));
    dynamic obj = Activator.CreateInstance(typeof(T));
    obj.Text = objText;

    if (applicantID != string.Empty)
    {
        obj.Attributes.Add("ApplicantID", applicantID);
    }
    if (hndl != null)
    {
        obj.Click += new EventHandler(hndl);
    }

    pnl.Controls.Add(obj);
    pnl.Controls.Add(new LiteralControl(HTMLTag.Insert(1, "/")));
}

Answer 1

, , , .net v3.5 "" , . ; , ...

    #region CreateControl() Overloads
            /// <summary>
            /// Creates a LinkButton control.
            /// </summary>
            /// <param name="objText">.Text property of this LinkButton control.</param>
            /// <param name="pnl">Panel this control will be attached to.</param>
            /// <param name="hndl">Event handler attached to this LinkButton control.</param>
            /// <param name="HTMLTag">Opening tag used to contain this control.</param>
            private void CreateControl(string objText,
                                       Panel pnl,
                                       EventHandler hndl,
                                       string HTMLTag)
            {
                pnl.Controls.Add(new LiteralControl(HTMLTag));
                LinkButton obj = new LinkButton();
                obj.Text = objText;
                obj.Click += new EventHandler(hndl);

                pnl.Controls.Add(obj);
                pnl.Controls.Add(new LiteralControl(HTMLTag.Insert(1, "/")));
            }
            /// <summary>
            /// Creates a Label control.
            /// </summary>
            /// <param name="objText">.Text property of this Label control.</param>
            /// <param name="pnl">Panel this control will be attached to.</param>
            /// <param name="HTMLTag">Opening tag used to contain this control.</param>
            private void CreateControl(string objText,
                                       Panel pnl,
                                       string HTMLTag)
            {
                pnl.Controls.Add(new LiteralControl(HTMLTag));
                Label obj = new Label();
                obj.Text = objText;

                pnl.Controls.Add(obj);
                pnl.Controls.Add(new LiteralControl(HTMLTag.Insert(1, "/")));
            }
            /// <summary>
            /// Creates the specified literal control.
            /// </summary>
            /// <param name="ControlText">HTML text containing instructions for creating the desired literal control.</param>
            /// <param name="pnl">Panel this literal control will be attached to.</param>
            private void CreateControl(string ControlText, 
                                       Panel pnl)
            {
                pnl.Controls.Add(new LiteralControl(ControlText));
            }
        #endregion

Answer 2

"dynamic" .net v3.5

. dynamic .NET 4.0.

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Answer 3

, , .

, ; WebControls Text Attributes Click,

, 3.5 - , :

private void CreateControl<T>(string objText, Panel pnl, string HTMLTag, 
    string applicantID, EventHandler hndl)
        where T : Control, new()
{
    pnl.Controls.Add(new LiteralControl(HTMLTag));
    T obj = new T();

    if (obj is ITextControl) (obj as ITextControl).Text = objText;

    if (applicantID != string.Empty && obj is WebControl)
        (obj as WebControl).Attributes.Add("ApplicantID", applicantID);


    if (obj is IButtonControl)
    {
        (obj as IButtonControl).Text = objText;
        if (hndl != null)
        {
            (obj as IButtonControl).Click += new EventHandler(hndl);
        }
    }

    pnl.Controls.Add(obj as Control);
    pnl.Controls.Add(new LiteralControl(HTMLTag.Insert(1, "/")));
}

:

protected void Page_Load(object sender, EventArgs e)
{
    var panel = new Panel();

    CreateControl<Button>("test", panel, "<td>", "123", (s, args) => Console.WriteLine("hello!"));
    CreateControl<Label>("test", panel, "<td>", "123", (s, args) => Console.WriteLine("hello!"));
    CreateControl<Panel>("test", panel, "<td>", "123", (s, args) => Console.WriteLine("hello!"));
    CreateControl<Literal>("test", panel, "<td>", "123", (s, args) => Console.WriteLine("hello!"));

    //This won't compile because object doesn't fit <control> constraint
    //CreateControl<object>("test", panel, "<td>", "123", (s, args) => Console.WriteLine("hello!"));
}

, 100%, . , , , , .

, optional parameters "" # 3.0, .net 3.5, .

Answer 4

.net 4.x , . JSON.

string jsonValue = "{name:'Pedro',lastName:'Mora'}";
dynamic Variable = new JavascriptSerializer().Deserialize<dynamic>(jsonValue);
return Variable.name;
//It will return "Pedro"

The thing is, you have to be sure that the value will not be null, but properties or attributes or methods or something called an object exist, and it takes values ​​at runtime.