/// <summary>
/// CSV格式化
/// </summary>
/// <param name="data">資料</param>
/// <returns>格式化資料</returns>
private static string FormatCsvField(string data) {
    return String.Format("\"{0}\"", data.Replace("\"", "\"\"\"").Replace("\n", "").Replace("\r", ""));
}

/// <summary>
/// 匯出DataGrid資料到Excel
 

/// </summary>
/// <param name="withHeaders">是否需要表頭</param>
/// <param name="grid">DataGrid</param>
/// <param name="dataBind"></param>
/// <returns>Excel內容字串</returns>
public static string ExportDataGrid(bool withHeaders, System.Windows.Controls.DataGrid grid, bool
 
 dataBind) {
    try {
        var strBuilder = new System.Text.StringBuilder();
        var source = (grid.ItemsSource as System.Collections.IList);
        if (source == null)
            return "";
        var headers = new List < string > ();
        List < string > bt = new List < string
 
 > ();

        foreach(var hr in grid.Columns) {
            //   DataGridTextColumn textcol = hr. as DataGridTextColumn;
            headers.Add(hr.Header.ToString());
            if (hr is DataGridTextColumn) //列繫結資料
            {
                DataGridTextColumn textcol = hr as DataGridTextColumn;
                if (textcol != null)
                    bt.Add((textcol.Binding as Binding).Path.Path.ToString()); //獲取繫結源

            } else if (hr is DataGridTemplateColumn) {
                if (hr.Header.Equals("操作"))
                    bt.Add("Id");
            } else {}
        }
        strBuilder.Append(String.Join(",", headers.ToArray())).Append("\r\n");
        foreach(var data in source) {
            var csvRow = new List < string > ();
            foreach(var ab in bt) {
                string s = ReflectionUtil.GetProperty(data, ab).ToString();
                if (s != null) {
                    csvRow.Add(FormatCsvField(s));
                } else {
                    csvRow.Add("\t");
                }
            }
            strBuilder.Append(String.Join(",", csvRow.ToArray())).Append("\r\n");
            // strBuilder.Append(String.Join(",", csvRow.ToArray())).Append("\t");
        }
        return strBuilder.ToString();
    } catch (Exception ex) {
        LogHelper.Error(ex);
        return "";
    }
}

/// <summary>
/// 匯出DataGrid資料到Excel為CVS檔案
/// 使用utf8編碼 中文是亂碼 改用Unicode編碼
///
/// </summary>
/// <param name="withHeaders">是否帶列頭</param>
/// <param name="grid">DataGrid</param>
public static void ExportDataGridSaveAs(bool withHeaders, System.Windows.Controls.DataGrid grid) {
    try {
        string data = ExportDataGrid(true, grid, true);
        var sfd = new Microsoft.Win32.SaveFileDialog{
            DefaultExt = "csv",
            Filter = "CSV Files (*.csv)|*.csv|All files (*.*)|*.*",
            FilterIndex = 1
        };
        if (sfd.ShowDialog() == true) {
            using(Stream stream = sfd.OpenFile()) {
                using(var writer = new StreamWriter(stream, System.Text.Encoding.Unicode)) {
                    data = data.Replace(",", "\t");
                    writer.Write(data);
                    writer.Close();
                }
                stream.Close();
            }
        }
        MessageBox.Show("匯出成功！");
    } catch (Exception ex) {
        LogHelper.Error(ex);
    }
}

public class ReflectionUtil{
    public static object GetProperty(object obj, string propertyName) {
        PropertyInfo info = obj.GetType().GetProperty(propertyName);
        if (info == null && propertyName.Split('.').Count() > 0) {
            object o = ReflectionUtil.GetProperty(obj, propertyName.Split('.')[0]);
            int index = propertyName.IndexOf('.');
            string end = propertyName.Substring(index + 1, propertyName.Length - index - 1);
            return ReflectionUtil.GetProperty(o, end);
        }
        object result = null;
        try {
            result = info.GetValue(obj, null);
        } catch (TargetException) {
            return "";
        }
        return result == null ? "" : result;
    }
}