关于Windows窗体应用程序

Question

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace GST.Masters
{
public partial class Customers : Heptanesia.Winforms.Ui.Forms.MainUC
{
public static string recCode
{ get; set; }
public string RC;
public bool insertFlag;
public Data.GSTDb.CustomersRow r;
public Data.GSTDb.CustomersGSTNosRow gr;
public Data.GSTDb.CustomersDataTable dt = new Data.GSTDb.CustomersDataTable();
public Customers()
{
InitializeComponent();
recCode = Guid.NewGuid().ToString();
this.Load += new EventHandler(this.Customers_Load);
this.Ts.SaveClicked += new Heptanesia.Winforms.Ui.Menu.ToolStrip.SaveClickedEventHandler(this.Ts_SaveClicked);
this.Ts.AddNewClicked += new Heptanesia.Winforms.Ui.Menu.ToolStrip.AddNewClickedEventHandler(this.Ts_AddNewClicked);
this.Ts.SearchClicked += new Heptanesia.Winforms.Ui.Menu.ToolStrip.SearchClickedEventHandler(this.Ts_SearchClicked);
this.DgGST.CellValidated += (sender, e) =>
{
string name = this.DgGST.Columns[e.ColumnIndex].Name;
if (name == "DGCCountryCode")
{
name = this.DgGST.Rows[e.RowIndex].Cells[name].Value.ToString();
this.statesBindingSource.Filter = "ParentCode = '" + name + "'";
if (!this.FormIsLoading)
{
this.DgGST.Rows[e.RowIndex].Cells["DGCStateCode"].Value = null;
this.DgGST.Rows[e.RowIndex].Cells["DGCCityCode"].Value = null;
}
}
else if (name == "DGCStateCode")
{
name = this.DgGST.Rows[e.RowIndex].Cells[name].Value.ToString();
this.citiesBindingSource.Filter = "ParentCode = '" + name + "'";
if (!this.FormIsLoading)
{
this.DgGST.Rows[e.RowIndex].Cells["DGCCityCode"].Value = null;
}
}
};
}
private void Ts_AddNewClicked(object sender, EventArgs e)
{
this.gSTDb.Customers.Rows.Clear();
r = this.gSTDb.Customers.NewCustomersRow();
this.gSTDb.Customers.AddCustomersRow(r);
Data.GSTDbTableAdapters.CustomersGSTNosTableAdapter CGT = new Data.GSTDbTableAdapters.CustomersGSTNosTableAdapter();
CGT.FillByParentCode(gSTDb.CustomersGSTNos, r.RecCode);
}
private void Ts_SearchClicked(object sender, EventArgs e)
{
Heptanesia.Winforms.Ui.Forms.SearchForm sf = new Heptanesia.Winforms.Ui.Forms.SearchForm();
sf.DataSource = new Data.GSTDbTableAdapters.CustomersTableAdapter().GetData();
sf.DisplayColumns = new string[] { "Name" };
sf.DisplayHeaders = new string[] { "Customers Name" };
sf.DisplayWidths = new int[] { 200 };
if (sf.ShowDialog(this) == DialogResult.OK)
{
this.RC = sf.ReturnRow["RecCode"].ToString();
this.customersTableAdapter.FillByRecCode(this.gSTDb.Customers, RC);
}
}
private void Ts_SaveClicked(object sender, EventArgs e)
{
string message = "Error: ";
try
{
this.customersBindingSource.EndEdit();
//if (this.DgGST.CurrentRow.DataBoundItem != null)
this.fkCustomerGSTNosCustomersBindingSource.EndEdit();
if (this.gSTDb.Customers.HasErrors)
message += Classes.Global.SetBindingSourcePositionAndGetError(this.customersBindingSource, this.gSTDb.Customers.GetErrors()[0]);
else if (this.gSTDb.CustomersGSTNos.HasErrors)
message += Classes.Global.SetBindingSourcePositionAndGetError(this.fkCustomerGSTNosCustomersBindingSource, this.gSTDb.CustomersGSTNos.GetErrors()[0]);
else
{
this.gSTDb.Customers.BeforeSave();
this.gSTDb.CustomersGSTNos.BeforeSave();
Data.GSTDbTableAdapters.TableAdapterManager tm = new Data.GSTDbTableAdapters.TableAdapterManager();
tm.CustomersTableAdapter = this.customersTableAdapter;
tm.CustomersGSTNosTableAdapter = this.customersGSTNosTableAdapter;
tm.UpdateAll(this.gSTDb);
message = "Record(s) Saved Successfully";
}
}
catch (Exception ex)
{
message += ex.Message;
}
MessageBox.Show(message, "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
private void Customers_Load(object sender, EventArgs e)
{
this.FormIsLoading = true;
this.customersTableAdapter.Fill(this.gSTDb.Customers);
this.customersGSTNosTableAdapter.Fill(this.gSTDb.CustomersGSTNos);
this.countriesTableAdapter.Fill(this.gSTDb.Countries);
this.statesTableAdapter.Fill(this.gSTDb.States);
this.citiesTableAdapter.Fill(this.gSTDb.Cities);
this.gSTDb.Customers.Rows.Clear();
if (this.gSTDb.Customers.Rows.Count == 0)
{
Data.GSTDb.CustomersRow r = this.gSTDb.Customers.NewCustomersRow();
this.gSTDb.Customers.AddCustomersRow(r);
}
this.FormIsLoading = false;
}
private void DgGST_DataError(object sender, DataGridViewDataErrorEventArgs e)
{
if (e.Exception is ArgumentException)
{
object value = DgGST.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
if (!((DataGridViewComboBoxColumn)DgGST.Columns[e.ColumnIndex]).Items.Contains(value))
{
((DataGridViewComboBoxCell)DgGST[e.ColumnIndex, e.RowIndex]).Value = DBNull.Value;
//((DataGridViewComboBoxColumn)dgv.Columns[e.ColumnIndex]).Items.Add(value);
e.ThrowException = false;
}
}
else
{
MessageBox.Show(e.Exception.Message);
e.Cancel = true;
}
}
}
}

我正在开发一个简单的发票应用程序，其中我有一个简单的客户屏幕模块。客户可以在Datagridview中拥有任意数量的GST记录。屏幕基于客户主数据（文本框）和客户主数据详细信息（Datagridview） ）通过外键的关系。我在这个项目中使用强类型数据集作为xsd文件。这个屏幕有3个按钮，即New，Save和Find toolstrip菜单。

当我在点击New Buttonstrip并保存后开始添加记录时，它会成功保存它，当我按下New时理想它应该清除行。这里的主要问题是它没有清除行??

我在这里附上cs文件。

我尝试过：

尽我所能。

1. 通过Rows.Clear（）清除行; 2）我尝试清除
2. 将Source和DataGridview设置为null后绑定。

什么都没有。