C#中用schema验证xml的合法性

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using DevExpress.XtraEditors;
using System.Xml;
using System.Xml.Schema;
using System.IO;

namespace IETMAuthor
{
    public partial class AssistantForm : DevExpress.XtraEditors.XtraForm
    {
        public AssistantForm()
        {
            InitializeComponent();
        }

        #region Private Variables & Constants           
        private const string PROCESSING = "处理正在进行中……";
        private const string READY = "尚未开始。";
        private const string FINISHED = "处理完成";
        private const string RIGHT = "，该步骤的处理返回了正确结果。";
        private const string WRONG = "，验证完成，但不是良好的XML文件";
        private const string VIEWDETAIL = "查看详细";
        string ErrString = "";


        private void AssistantForm_Load(object sender, EventArgs e)
        {
            this.dgvSteps.Rows.Clear();

            for (int intLoop = 1; intLoop <= 2; intLoop++)
            {
                this.dgvSteps.Rows.Add(
                    IETMAuthor.Properties.Resources.PROCESS_READY,
                    intLoop.ToString(),
                    "第" + intLoop.ToString() + "个步骤&" + READY,
                    string.Empty
                    );
            }
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            ErrString = "";
            this.dgvSteps.Rows.Clear();

            for (int intLoop = 1; intLoop <= 2; intLoop++)
            {
                this.dgvSteps.Rows.Add(
                    IETMAuthor.Properties.Resources.PROCESS_READY,
                    intLoop.ToString(),
                    "第" + intLoop.ToString() + "个步骤&" + READY,
                    string.Empty
                    );
            }

            string dataFile = buttonEdit1.Text;

            if (dataFile.Length <= 0)
            {
                ErrString = "请选择要验证的XML文件";
               
                this.dgvSteps.Rows[0].Cells[1].Value = string.Empty;
                this.dgvSteps.Rows[0].Cells[0].Value = IETMAuthor.Properties.Resources.PROCESS_WRONG;
                this.dgvSteps.Rows[0].Cells[2].Value = WRONG;
                this.dgvSteps.Rows[0].Cells[3].Value = VIEWDETAIL;
                this.dgvSteps.Rows.Remove(this.dgvSteps.Rows[1]);            
            }
            else
            {
                #region 验证
                StringReader sRead = null;
                XmlReader xmlRead = null;
                XmlSchemaSet schemaSet;

                try
                {
                    schemaSet = new XmlSchemaSet();

                    sRead = new StringReader(File.ReadAllText(dataFile));

                    //schemaSet.Add(null, Application.StartupPath + "\xml\" + "schema.xsd");
                    schemaSet.Add(null, txtNamespaceUrl.Text);

                    XmlReaderSettings settings = new XmlReaderSettings();
                    settings.ProhibitDtd = false;
                    settings.ValidationEventHandler += new ValidationEventHandler(this.validationEventHandler);
                    settings.ValidationType = ValidationType.Schema;
                    settings.Schemas = schemaSet;

                    xmlRead = XmlReader.Create(sRead, settings);
                    while (xmlRead.Read())
                    {

                    }

                    if (ErrString.ToString() == String.Empty)
                    {

                       this.dgvSteps.Rows[1].Cells[2].Value = "验证成功,合规的良好的XML文件";
                       this.dgvSteps.Rows[1].Cells[0].Value = IETMAuthor.Properties.Resources.PROCESS_RIGHT;
                    }
                    else
                    {

                          this.dgvSteps.Rows[1].Cells[3].Value = VIEWDETAIL;
                          this.dgvSteps.Rows[1].Cells[2].Value = WRONG;
                          this.dgvSteps.Rows[1].Cells[0].Value = IETMAuthor.Properties.Resources.PROCESS_WRONG;
                      
                    }
                }
                catch (XmlException exec)
                {
                     ErrString = exec.Message;
                     this.dgvSteps.Rows[1].Cells[3].Value = VIEWDETAIL;
                     this.dgvSteps.Rows[1].Cells[2].Value = WRONG;
                     this.dgvSteps.Rows[1].Cells[0].Value = IETMAuthor.Properties.Resources.PROCESS_WRONG;
                 
                }
                finally
                {
                    if (xmlRead != null)
                    {
                        xmlRead.Close();
                    }
                }

                this.dgvSteps.Rows[0].Cells[2].Value = FINISHED;
                this.dgvSteps.Rows[0].Cells[0].Value = IETMAuthor.Properties.Resources.PROCESS_RIGHT;

                # endregion
            }
        }

        //exit the demo
        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Dispose();
        }

        private void buttonEdit1_Click(object sender, EventArgs e)
        {
            this.ofd_xml.ShowDialog();
            this.buttonEdit1.Text = ofd_xml.FileName;
        }

        #endregion


        //when a step result in a failure, you may click the last cell of the step to see the detailed message
        private void dgvSteps_CellClick(object sender, DataGridViewCellEventArgs e)
        {  

            if (e.ColumnIndex == 3 &&
                e.RowIndex >= 0 &&
                this.dgvSteps.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString() == VIEWDETAIL)
            {
                MessageBox.Show(
                    "第" + System.Convert.ToString(e.RowIndex + 1) + "个步骤发生了错误：

" + ErrString,
                    "提示",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Warning);
            }
        }


        //when any step is processing, you cannot close the form
        private void frmMain_FormClosing(object sender, FormClosingEventArgs e)
        {

        }    


    
        void validationEventHandler(object sender, System.Xml.Schema.ValidationEventArgs e)
        {
            if (e.Severity == XmlSeverityType.Warning)//区分是警告还是错误 
            {
                //Console.WriteLine("验证成功!警告：" + e.Message);
                ErrString += "验证成功!警告：" + e.Message;
            }
            else
            {
                // Console.WriteLine("验证失败");
                ErrString += "Err:" + e.Message;
            }
        }
      

    }
}

验证器结果图：