CSLA 实现保存和删除按钮的代码

Question

我是 CSLA 的新手，所以这是我的问题。我有一个带有 datagridview 和 2 个按钮的简单 windows 表单应用程序，Save 和 Delete.I 需要一个解决方案来实现 Save 按钮的 Save() 方法，以及 Delete button.I 的 Delete() 方法相信它真的很简单，但我不知道如何调用这些 2 methods.Datagridview 控件是可编辑的，所以我的想法是当用户添加新行或编辑一些现有单元格并单击按钮保存时，这些数据将是记录在我的数据库中。提前致谢！

我正在使用根可编辑集合和子可编辑原型。这是 root 的代码：

[Serializable]
public class PDVCollection : BusinessBindingListBase<PDVCollection,PDV>
{
    private PDVCollection()
    {
        AllowNew = true;
    }
    protected override object AddNewCore()
    {
        var item = PDV.PDV();
        Add(item);
        return item;
    }

    #region Factory Methods


    public static PDVCollection GetAll()
    {
        return DataPortal.Fetch<PDVCollection>();
    }

    protected override void DataPortal_Update()
    {
        Child_Update();
    }

    #endregion

    #region Data Access
    private void DataPortal_Fetch()
    {
        RaiseListChangedEvents = false;

        MySqlConnection con = new MySqlConnection("server=localhost;user id=root;password=1234;persistsecurityinfo=True;database=dbpos");
        MySqlCommand cmd = new MySqlCommand("usp_PDVSelect", con);
        cmd.CommandType = System.Data.CommandType.StoredProcedure;

        try
        {
            con.Open();
            MySqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                var stopa = PDV.GetPDV(dr);
                Add(stopa);
            }
            con.Close();
        }
        catch (Exception xcp)
        {
            throw xcp;
        }

        RaiseListChangedEvents = true;
    }

}
    #endregion

这是可编辑子代码

[Serializable]
public class PDV : BusinessBase<PDV>
{
    public static readonly PropertyInfo<int> IdProperty = RegisterProperty<int>(c => c.Id);
    public int Id
    {
        get { return GetProperty(IdProperty); }
        private set { LoadProperty(IdProperty, value); }
    }

    public static readonly PropertyInfo<Guid> UidProperty = RegisterProperty<Guid>(c => c.Uid);
    public Guid Uid
    {
        get { return GetProperty(UidProperty); }
        private set { LoadProperty(UidProperty, value); }
    }

    public static readonly PropertyInfo<decimal> StopaProperty = RegisterProperty<decimal>(c => c.Stopa);
    public decimal Stopa
    {
        get { return GetProperty(StopaProperty); }
        set { SetProperty(StopaProperty, value); }
    }


    #region Factory Methods

    internal static PDV NewPDV()
    {
        return DataPortal.CreateChild<PDV>();
    }

    internal static PDV GetPDV(MySqlDataReader dr)
    {
        return DataPortal.FetchChild<StopaPDV>(dr);
    }

    private StopaPDV()
    {

    }

    #endregion



    #region DataAccess

    protected override void Child_Create()
    {
        LoadProperty(UidProperty, Guid.NewGuid());
        base.Child_Create();
    }

    private void Child_Fetch(MySqlDataReader dr)
    {
        LoadProperty(IdProperty,Int32.Parse(dr[0].ToString()));
        LoadProperty(UidProperty, Guid.Parse(dr[1].ToString()));
        LoadProperty(StopaProperty, Decimal.Parse(dr[2].ToString()));

    }

    private void Child_Insert()
    {
        MySqlConnection con = new MySqlConnection("server=localhost;user id=root;password=1234;persistsecurityinfo=True;database=dbpos");
        MySqlCommand cmd = new MySqlCommand("usp_PDVInsert", con);
        cmd.CommandType = System.Data.CommandType.StoredProcedure;
        cmd.Parameters.Add("_uid", MySqlDbType.VarChar, 36).Value = Uid;
        cmd.Parameters.Add("_stopa", MySqlDbType.Decimal).Value = Stopa;
        cmd.Parameters.Add("_id", MySqlDbType.Int32).Direction = System.Data.ParameterDirection.Output;
        int ID = 0;
        try
        {
            con.Open();
            cmd.ExecuteNonQuery();
            ID =  Convert.ToInt32(cmd.Parameters["_id"].Value);
            con.Close();
        }
        catch (Exception xcp)
        {

            throw xcp;
        }



    }

    private void Child_Update()
    {
        MySqlConnection con = new MySqlConnection("server=localhost;user id=root;password=1234;persistsecurityinfo=True;database=dbpos");
        MySqlCommand cmd = new MySqlCommand("usp_PDVUpdate", con);
        cmd.CommandType = System.Data.CommandType.StoredProcedure;
        cmd.Parameters.Add("_stopa",MySqlDbType.Decimal).Value = Stopa;

        try
        {
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
        catch (Exception xcp)
        {

            throw xcp;
        }
    }

    private void Child_DeleteSelf()
    {
        MySqlConnection con = new MySqlConnection("server=localhost;user id=root;password=1234;persistsecurityinfo=True;database=dbpos");
        MySqlCommand cmd = new MySqlCommand("usp_PDVDeleteById", con);
        cmd.CommandType = System.Data.CommandType.StoredProcedure;
        cmd.Parameters.Add("_id", MySqlDbType.Int32).Value = Id;

        try
        {
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
        catch (Exception xcp)
        {

            throw xcp;
        }
    }
    #endregion
}

Answer 1

如果我没理解错的话，您正在寻求有关如何实现保存和删除按钮事件处理程序的帮助，这些处理程序将作用于您的 CSLA 可编辑根 List/Collection 以实现保存或删除中的数据业务对象。

假设这确实是您所追求的，那么以下内容应该有所帮助。

保存

在您的“保存”按钮事件处理程序中，您只需在 PDVCollection 实例上调用 Save() 实例方法。

删除

至于“删除”按钮事件处理程序，您需要知道要删除集合中的哪一项，然后将其从 parent/root 集合中删除。

代码

下面是表单背后代码的一个简单示例（带有 2 个按钮、一个 DataGridView 和一个 BindingSource 控件）：

public partial class MainForm : Form
{
    private BusinessLogic.PDVCollection _pdvColllection;
    private BusinessLogic.PDV _pdvCurrentlySelected;

    public MainForm()
    {
        InitializeComponent();

        // Keep a reference to the editable root collection
        _pdvColllection = BusinessLogic.PDVCollection.GetList();

        // Initialise the BindingSource with data. The DataGridView is connected to the BindingSource
        pdvCollectionBindingSource.DataSource = _pdvColllection;
    }

    private void pdvCollectionBindingSource_CurrentChanged( object sender, EventArgs e )
    {
        // Update a local reference with the currently selected item in the binding source (set by the DataGridView)
        _pdvCurrentlySelected = pdvCollectionBindingSource.Current as BusinessLogic.PDV;
    }

    private void saveButton_Click( object sender, EventArgs e )
    {
        // Save the root collection - this will update all of the items in the collection.
        // - Note a new root collection is returned.
        if ( !_pdvColllection.IsValid )
        {
            MessageBox.Show( "Cannot save list because some items are invalid", "Save", MessageBoxButtons.OK, MessageBoxIcon.Information );
            return;
        }

        _pdvColllection = _pdvColllection.Save();

        // Update the binding source with the new instance;
        pdvCollectionBindingSource.DataSource = null;
        pdvCollectionBindingSource.DataSource = _pdvColllection;
    }

    private void deleteButton_Click( object sender, EventArgs e )
    {
        // Delete requires a PDV instance to be selected in the DataGridView
        if ( _pdvCurrentlySelected == null )
        {
            MessageBox.Show( "Item to delete not selected", "Delete", MessageBoxButtons.OK, MessageBoxIcon.Information );
            return;
        }

        _pdvColllection.Remove( _pdvCurrentlySelected );

        // Depending on whether you want to save this delete to the background immediately, or leave it up to the user you may want to 
        // Save the root collection next:
        saveButton.PerformClick();
    }
}

希望对您有所帮助。

CSLA 实现保存和删除按钮的代码

CSLA Implementing code for Save and Delete Buttons

c#

csla

保存

删除

代码