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   源码介绍

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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;
            }
        }

    }
}