实例介绍
【实例简介】
【实例截图】
【核心代码】
using System;
using System.Data;
using System.Windows.Forms;
namespace DataGridView
{
public partial class frmMain : Form
{
public frmMain()
{
InitializeComponent();
}
private DataSet addressList;
private void frmMain_Load(object sender, EventArgs e)
{
//从xml中加载数据
addressList = new DataSet("AddressList");
addressList.ReadXmlSchema(".\\AddressList.xsd");
addressList.ReadXml(".\\AddressList.xml", XmlReadMode.Auto);
addressList.Locale = System.Globalization.CultureInfo.CurrentUICulture;
addressList.AcceptChanges();
//绑定到datagridview
dataGridView1.AutoGenerateColumns = false;
dataGridView1.DataSource = addressList;
dataGridView1.DataMember = "UserList";
}
private void 新建NToolStripMenuItem_Click(object sender, EventArgs e)
{
dataGridView1.CurrentCell = dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells["UserName"];
dataGridView1.BeginEdit(false);
}
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
if (e.RowIndex != 1 && !dataGridView1.Rows[e.RowIndex].IsNewRow)
{
tsslUserName.Text = dataGridView1.Rows[e.RowIndex].Cells["UserName"].Value.ToString();
}
}
private void 退出XToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Close();
}
private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
//验证编辑的单元格的数据
DataGridViewCell c = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];
switch (dataGridView1.Columns[e.ColumnIndex].Name)
{
case "UserName":
int UserNameMaxLength = addressList.Tables["UserList"].Columns["UserName"].MaxLength;
if (e.FormattedValue.ToString().Length > UserNameMaxLength)
{
string UserNameError = "用户名不能超过" UserNameMaxLength.ToString() "个字符";
c.ErrorText = UserNameError;
e.Cancel = false;
}
else if (e.FormattedValue.ToString().Length == 0)
{
string UserNameError = "用户名不能为空";
c.ErrorText = UserNameError;
e.Cancel = false;
}
else
{
if (c.ErrorText != string.Empty)
{
c.ErrorText = string.Empty;
}
}
break;
case "Telephone":
int TelephoneMaxLength = addressList.Tables["UserList"].Columns["UserName"].MaxLength;
if (e.FormattedValue.ToString().Length > TelephoneMaxLength)
{
string TelephoneError = "电话号码不能超过" TelephoneMaxLength.ToString() "个字符";
c.ErrorText = TelephoneError;
e.Cancel = false;
}
else
{
if (c.ErrorText != string.Empty)
{
c.ErrorText = string.Empty;
}
}
break;
case "QQ":
int QQMaxLength = addressList.Tables["UserList"].Columns["QQ"].MaxLength;
if (e.FormattedValue.ToString().Length > QQMaxLength)
{
string QQError = "电话号码不能超过" QQMaxLength.ToString() "个字符";
c.ErrorText = QQError;
e.Cancel = false;
}
else
{
if (c.ErrorText != string.Empty)
{
c.ErrorText = string.Empty;
}
}
break;
case "MSN":
int MSNMaxLength = addressList.Tables["UserList"].Columns["MSN"].MaxLength;
if (e.FormattedValue.ToString().Length > MSNMaxLength)
{
string MSNError = "电话号码不能超过" MSNMaxLength.ToString() "个字符";
c.ErrorText = MSNError;
e.Cancel = false;
}
else
{
if (c.ErrorText != string.Empty)
{
c.ErrorText = string.Empty;
}
}
break;
case "Address":
int AddressMaxLength = addressList.Tables["UserList"].Columns["Address"].MaxLength;
if (e.FormattedValue.ToString().Length > AddressMaxLength)
{
string AddressError = "电话号码不能超过" AddressMaxLength.ToString() "个字符";
c.ErrorText = AddressError;
e.Cancel = false;
}
else
{
if (c.ErrorText != string.Empty)
{
c.ErrorText = string.Empty;
}
}
break;
case "Remark":
int RemarkMaxLength = addressList.Tables["UserList"].Columns["Remark"].MaxLength;
if (e.FormattedValue.ToString().Length > RemarkMaxLength)
{
string RemarkError = "电话号码不能超过" RemarkMaxLength.ToString() "个字符";
c.ErrorText = RemarkError;
e.Cancel = false;
}
else
{
if (c.ErrorText != string.Empty)
{
c.ErrorText = string.Empty;
}
}
break;
}
}
private void dataGridView1_RowValidating(object sender, DataGridViewCellCancelEventArgs e)
{
if (dataGridView1.Rows[e.RowIndex].ErrorText != string.Empty)
{
dataGridView1.Rows[e.RowIndex].ErrorText = string.Empty;
}
if (e.RowIndex == (dataGridView1.Rows.Count - 2) && dataGridView1.Rows[e.RowIndex 1].IsNewRow)
{
DataGridViewRow row = dataGridView1.Rows[e.RowIndex];
if (row.Cells["UserID"].Value == DBNull.Value)
{
DataRow[] drs = addressList.Tables["UserList"].Select("UserID=Max(UserID)");
int userId = 1;
//计算新数据的ID
if (drs.Length == 0)
{
userId = 1;
}
else
{
userId = (int)drs[0]["UserID"] 1;
}
row.Cells["UserID"].Value = userId;
}
}
}
private void dataGridView1_DefaultValuesNeeded(object sender, DataGridViewRowEventArgs e)
{
//输入新记录时发生，给UserID设置一个默认值
e.Row.Cells["UserID"].Value = DBNull.Value;
}
private void toolStripMenuItem1_Click(object sender, EventArgs e)
{
Save();
}
/// <summary>
/// 保存数据到xml文档
/// </summary>
private void Save()
{
try
{
addressList.WriteXml(".\\AddressList.xml");
addressList.AcceptChanges();
MessageBox.Show("保存成功", "保存通讯录", MessageBoxButtons.OK, MessageBoxIcon.None);
}
catch
{
MessageBox.Show("保存失败", "保存通讯录", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void 删除DToolStripMenuItem_Click(object sender, EventArgs e)
{
DataGridViewSelectedRowCollection selectedRows = dataGridView1.SelectedRows;//获取选中的行的集合
if (selectedRows.Count > 0)
{
DialogResult result = MessageBox.Show("你确定要删除选定的数据吗？", "删除数据", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (result == DialogResult.Yes)
{
//迭代删除选中行
foreach (DataGridViewRow row in selectedRows)
{
dataGridView1.Rows.Remove(row);
}
}
}
}
private void frmMain_FormClosing(object sender, FormClosingEventArgs e)
{
DataTable changeDT = addressList.Tables["UserList"].GetChanges();//获取数据集中所有的更改
if (changeDT != null && changeDT.Rows.Count > 0)
{
DialogResult result = MessageBox.Show("有未保存的数据，是否保存?", "保存数据", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
switch (result)
{
case DialogResult.Yes:
Save();
e.Cancel = false;
break;
case DialogResult.No:
e.Cancel = false;
break;
case DialogResult.Cancel:
e.Cancel = true;
break;
}
}
}
private void dataGridView1_DataError(object sender, DataGridViewDataErrorEventArgs e)
{
if (e.Context == DataGridViewDataErrorContexts.Commit)
{
dataGridView1.Rows[e.RowIndex].ErrorText = e.Exception.ToString();
e.Cancel = true;
}
}
}
}
标签： winform GridView 实例 DataGridView d
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