C # Write a third-party control that implements a key value for a form control

in the previous blog, the use of the method of writing a third-party control, implemented to the form control Text property assignment, such as: TextBox , Combox and so on. There are assignments, and of course there are value operations. From the control of the form to take a value, and then into the variable or entity properties, passed to the data access layer to add, update, and so on, we often use. How do you implement a key value?

the method used has been explained in detail in the previous blog post, and it is no longer The statement of exhaustion up.

The code is written here:

The function of this method is to iterate over the controls in the incoming form and get the corresponding properties whose values are assigned to the entity class.

////<summary>///From the form control to populate the student entity class in///</summary> <param name= "Enstudent" > Student entities </param> public static void Fillstuentitybyform (Stuentity enstudent, Form thisfrm) {//traverse the control on the form foreach (Control ctrl in THISFRM.                    Controls) {//control inherits the interface if (Ctrl is Interface1) {                        Whether it belongs to the text box if (Ctrl is Textboxex) {//Assign a value to the Entity property Setstuvalue (Enstudent, ((TEXTBOXEX) ctrl). DataField, CTRL.                    Text); }//if it belongs to the drop-down box else if (Ctrl is Comboxex) {Setstuvalue (enstudent , ((COMBOXEX) ctrl). DataField, ((COMBOXEX) ctrl).                    Text); }                }            }        }

Use reflection to assign values to each property of an entity:

        <summary>////////</summary>//        <param name= "enstudent" > Student entity Class </ param>//        <param name= "datafiled" > Matching string </param>//        <param name= "value" > Value of Form Control </ param> public        static void Setstuvalue (Stuentity enstudent, String datafiled, String Value)        {            PropertyInfo field = Enstudent.gettype (). GetProperty (datafiled);            Field. SetValue (enstudent, Value, null);        }

Takes the property of the returned entity out and spells it into a string.

        <summary>////        combine attributes of entities into strings to return///</summary>//        <param name= "Enstudent" ></ param>        //<returns></returns> public static string Getstr (Stuentity enstudent)        {            propertyinfo[] fields = Enstudent.gettype (). GetProperties ();            StringBuilder sb = new StringBuilder ();            foreach (PropertyInfo pi in fields)            {                sb. Append (pi. Name). Append (":"). Append (pi. GetValue (enstudent, NULL)). Append ("\ r \ n");            }            Return SB. ToString ();        }

Client calling Code:

        private void Btngetvalue_click (object sender, EventArgs e)        {            stuentity enstudent = new stuentity ();            Call the function            Frmhelper.fillstuentitybyform (enstudent, this) that fills the entity's properties;            Displays the properties of the entity as a            string str = FRMHELPER.GETSTR (enstudent);            MessageBox.Show (str);        }

Display effect:

The implementation process is like this, there is nothing wrong place to welcome the point!

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C # Write a third-party control that implements a key value for a form control