ASP.NET偷懒大法四（动态生成表单对象）

做表单提交时，经常的做法是拖TextBox等控件到页面，然后点提交按钮，cs代码把控件的值一个一个的赋给一个对象，然后调用一个Save的方法 提交成功！烦琐的操作，基本在每一个表单添加修改的时候做一遍。我们这些烦琐的事情交给.net做吧。

从Panel继承一个自定义控件，当成一个区间，写一个方法遍历这个区间所有的控件，自动给类赋值

首页给这个控件一个属性

public string Entity
        {
            get
            {
                String s = (String)ViewState["Entity"];
                return ((s == null) ? String.Empty : s);
            }

            set
            {
                ViewState["Entity"] = value;
            }
        }

属性的值就是这个表单所操作的实体类

然后写个方法，反射实体类，变量区间中所有的控件，赋值

public object GetEntity()
        {
            Type t = Type.GetType(Entity, true);
            object entity = Activator.CreateInstance(t);
            foreach (object var in this.Controls)
            {
                Type ControlType = var.GetType();
                switch (ControlType.Name)
                {
                    case "SMTextBox":
                        if (!string.IsNullOrEmpty((var as FrameworkWeb.Web.SMTextBox).ID))
                        {
                            System.Reflection.PropertyInfo propertyInfo = t.GetProperty((var as FrameworkWeb.Web.SMTextBox).ID);
                            if (propertyInfo != null)
                            {
                                string tempText = (var as FrameworkWeb.Web.SMTextBox).Text;
                                if (!string.IsNullOrEmpty(tempText))
                                    propertyInfo.SetValue(entity, Convert.ChangeType(tempText, propertyInfo.PropertyType), null);
                            }
                        }
                        break;
                    case "TextBox":
                        if (!string.IsNullOrEmpty((var as TextBox).ID))
                        {
                            System.Reflection.PropertyInfo propertyInfo = t.GetProperty((var as TextBox).ID);
                            if (propertyInfo != null)
                            {
                                string tempText = (var as TextBox).Text;
                                if (!string.IsNullOrEmpty(tempText))
                                    propertyInfo.SetValue(entity, Convert.ChangeType(tempText, propertyInfo.PropertyType), null);
                            }
                        }
                        break;
                    case "SMDTPicker":
                        if (!string.IsNullOrEmpty((var as SMDTPicker).ID))
                        {
                            System.Reflection.PropertyInfo propertyInfo = t.GetProperty((var as SMDTPicker).ID);
                            if (propertyInfo != null)
                            {
                                string tempText = (var as SMDTPicker).Text;
                                if (!string.IsNullOrEmpty(tempText))
                                    propertyInfo.SetValue(entity, Convert.ChangeType(tempText, propertyInfo.PropertyType), null);
                            }
                        }
                        break;
                    case "DropDownList":
                        if (!string.IsNullOrEmpty((var as DropDownList).ID))
                        {
                            System.Reflection.PropertyInfo propertyInfo = t.GetProperty((var as DropDownList).ID);
                            if (propertyInfo != null)
                            {
                                string tempText = (var as DropDownList).SelectedValue;
                                propertyInfo.SetValue(entity, Convert.ChangeType(tempText, propertyInfo.PropertyType), null);
                            }
                        }
                        break;

                    case "HiddenField":
                        if (!string.IsNullOrEmpty((var as HiddenField).ID))
                        {
                            System.Reflection.PropertyInfo propertyInfo = t.GetProperty((var as HiddenField).ID);
                            if (propertyInfo != null)
                            {
                                string tempText = (var as HiddenField).Value;
                                propertyInfo.SetValue(entity, Convert.ChangeType(tempText, propertyInfo.PropertyType), null);
                            }
                        }
                        break;
                }
            }

            return entity;
        }

前台调用的时候直接执行这个方法就可以得到这个对象了，如果有一些特殊的情况，再二次处理就ok啦。

然后就是修改啦，修改的时候需要先给控件赋值，然后用户修改后提交。这个也可以用类似的原来简化操作。

给我们的控件增加一个数据库源的属性

public virtual object DataSource
        {
            get
            {
                return this.dataSource;
            }

            set
            {
                this.dataSource = value;
            }
        }

增加一个数据绑定的时候的事件

public delegate void SMFormDataBindEventHandler(object source, SMFormEventArgs e);

[Category("Action"), Description("DataBind")]
public event SMFormDataBindEventHandler DataBindCommand;

///这里存的是自动赋好值的一个对象，方便二次处理
public class SMFormEventArgs : EventArgs
    {
        public readonly object tempObject;
        public SMFormEventArgs(object tempObject)
        {
            this.tempObject = tempObject;
        }
    }

这是为了处理特殊的情况，有时候有些控件可能不是直接取数据库的值，就可以利用这个事件进行二次处理啦

然后给控件赋值

protected new void DataBind()
        {
            PropertyInfo p;

            foreach (Control var in this.Controls)
            {
                switch (var.GetType().Name.ToUpper())
                {
                    case "TEXTBOX":
                        System.Web.UI.WebControls.TextBox textBox = var as System.Web.UI.WebControls.TextBox;
                        p = DataSource.GetType().GetProperty(var.ID);
                        if (p != null)
                            textBox.Text = p.GetValue(DataSource, null).ToString().Trim();
                        break;
                    case "SMTEXTBOX":
                        FrameworkWeb.Web.SMTextBox smtextBox = var as FrameworkWeb.Web.SMTextBox;
                        p = DataSource.GetType().GetProperty(var.ID);
                        if (p != null)
                            smtextBox.Text = p.GetValue(DataSource, null).ToString().Trim();
                        break;
                    case "DROPDOWNLIST":
                        System.Web.UI.WebControls.DropDownList ddl = var as System.Web.UI.WebControls.DropDownList;
                        p = DataSource.GetType().GetProperty(var.ID);
                        if (p != null)
                        {
                            object o = p.GetValue(DataSource, null);
                            if (o!=null)
                            ddl.SelectedValue = p.GetValue(DataSource, null).ToString().Trim();
                        }
                        break;
                    case "LITERAL":
                        System.Web.UI.WebControls.Literal lit = var as System.Web.UI.WebControls.Literal;
                        p = DataSource.GetType().GetProperty(lit.ID);
                        if (p != null)
                            lit.Text = p.GetValue(DataSource, null).ToString().Trim();
                        break;
                    case "HIDDENFIELD":
                        System.Web.UI.WebControls.HiddenField hf = var as System.Web.UI.WebControls.HiddenField;
                        p = DataSource.GetType().GetProperty(hf.ID);
                        if (p != null)
                            hf.Value = p.GetValue(DataSource, null).ToString().Trim();
                        break;
                    case "SMDTPICKER":
                        FrameworkWeb.Web.SMDTPicker smDTPicker = var as FrameworkWeb.Web.SMDTPicker;
                        p = DataSource.GetType().GetProperty(var.ID);
                        if (p != null)
                            smDTPicker.Text = p.GetValue(DataSource, null).ToString().Trim();
                        break;
                        break;
                }
            }
        }

这样这个控件就基本完成了，调用的时候基本不用写什么代码啦

拖好控件，在提交的事件中只需要写

Model.BTS item = smform.GetEntity() as Model.BTS;
DAL.BTS.Save(item);

修改的时候

Model.BTS btsModel== DAL.BTS.GetModel("sCode");
smform.DataSource = btsModel;

然后在事件中做二次处理

protected void smform_DataBindCommand(object source, FrameworkWeb.Form.SMFormEventArgs e)
    {
        Model.BTS item = e.tempObject as Model.BTS;
        if (item != null)
        {
            DropDownList dp = smform.FindControl("isEnable") as DropDownList;
            dp.Items.FindByValue(item.isEnable.ToString()).Selected = true;
            if (item.dicSectorType>0)
                (smform.FindControl("dicSectorType") as DropDownList).Items.FindByValue(item.dicSectorType.ToString()).Selected = true;
            if (item.dicAreaType > 0)
            (smform.FindControl("dicAreaType") as DropDownList).Items.FindByValue(item.dicAreaType.ToString()).Selected = true;

            //if (item.fkDeviceID > 0)
            //    (smform.FindControl("fkDeviceID") as DropDownList).Items.FindByValue(item.fkDeviceID.ToString()).Selected = true;
        }
    }

然后保存
Model.BTS item = smform.GetEntity() as Model.BTS;
DAL.BTS.Update(item);

一切就是如此easy :)