C# 代码：

 /// <summary>
 /// 以字符串表示的SQLServer数据类型
 /// </summary>
 /// <param name="iXTypeVale"></param>
 /// <returns></returns>
 public static string GetSQLServerXTypeString(int iXTypeVale)
 {
     /*
     34 image
     35 text
     36 uniqueidentifier
     48 tinyint
     52 smallint
     56 int
     58 smalldatetime
     59 real
     60 money
     61 datetime
     62 float
     98 sql_variant
     99 ntext
     104 bit
     106 decimal
     108 numeric
     122 smallmoney
     127 bigint
     165 varbinary
     167 varchar
     173 binary
     175 char
     189 timestamp
     231 sysname
     231 nvarchar
     239 nchar
     */

     switch (iXTypeVale)
     {
         case 34:
             return "image";
         case 35:
             return "text";
         case 36:
             return "uniqueidentifier";
         case 48:
             return "tinyint";
         case 52:
             return "smallint";
         case 56:
             return "int";
         case 58:
             return "smalldatetime";
         case 59:
             return "real";
         case 60:
             return "money";
         case 61:
             return "datetime";
         case 62:
             return "float";
         case 98:
             return "sql_variant";
         case 99:
             return "ntext";
         case 104:
             return "bit";
         case 106:
             return "decimal";
         case 108:
             return "numeric";
         case 122:
             return "smallmoney";
         case 127:
             return "bigint";
         case 165:
             return "varbinary";
         case 167:
             return "varchar";
         case 173:
             return "binary";
         case 175:
             return "char";
         case 189:
             return "timestamp";
         case 231:
             return "nvarchar";
         //case 231:
         //SQL Server 实例包括用户定义的名为 sysname 的数据类型。
         //sysname 用于表列、变量以及用于存储对象名的存储过程参数。sysname 的精确定义与标识符规则相关；
         //因此，SQL Server 的各个实例会有所不同。sysname 与 nvarchar(128) 作用相同。
         //return "sysname";
         case 239:
             return "nchar";
         case 241:
             return "xml";

     }

     return "未知";
 }

C++ CLI(错的，永远返回NULL）

Type^ csharp_Field::SqlDbTypeConvertToCSharpType(SqlDbType sqlType)
{
    switch (sqlType)
    {
    case SqlDbType::BigInt:
        return System::Type::GetType("Int64");
    case SqlDbType::Binary:
        return System::Type::GetType("Object");
    case SqlDbType::Bit:
        return System::Type::GetType("Boolean");
    case SqlDbType::Char:
        return System::Type::GetType("String");
    case SqlDbType::DateTime:
        return System::Type::GetType("DateTime");
    case SqlDbType::Decimal:
        return System::Type::GetType("Decimal");
    case SqlDbType::Float:
        return System::Type::GetType("Double");
    case SqlDbType::Image:
        return System::Type::GetType("Object");
    case SqlDbType::Int:
        return System::Type::GetType("Int32");
    case SqlDbType::Money:
        return System::Type::GetType("Decimal");
    case SqlDbType::NChar:  
        return System::Type::GetType("String");
    case SqlDbType::NText:
        return System::Type::GetType("String");
    case SqlDbType::NVarChar:
        return System::Type::GetType("String");
    case SqlDbType::Real:
        return System::Type::GetType("Single");
    case SqlDbType::SmallDateTime:
        return System::Type::GetType("DateTime");
    case SqlDbType::SmallInt:
        return System::Type::GetType("Int16");
    case SqlDbType::SmallMoney:
        return System::Type::GetType("Decimal");
    case SqlDbType::Text:
        return System::Type::GetType("String");
    case SqlDbType::Timestamp:
        return System::Type::GetType("Object");
    case SqlDbType::TinyInt:
        return System::Type::GetType("Byte");
    case SqlDbType::Udt://自定义的数据类型
        return System::Type::GetType("Object");
    case SqlDbType::UniqueIdentifier:
        return System::Type::GetType("Object");
    case SqlDbType::VarBinary:
        return System::Type::GetType("Object");
    case SqlDbType::VarChar:
        return System::Type::GetType("String");
    case SqlDbType::Variant:
        return System::Type::GetType("Object");
    case SqlDbType::Xml:
        return System::Type::GetType("Object");
    default:
        return null;
        break;
    }
}

C++ CLI(还是错的，永远返回NULL）

Type^ csharp_Field::SqlDbTypeConvertToCSharpType(SqlDbType sqlType)
{
    switch (sqlType)
    {
    case SqlDbType::BigInt:
        return System::Type::GetType("System::Int64");
    case SqlDbType::Binary:
        return System::Type::GetType("System::Object");
    case SqlDbType::Bit:
        return System::Type::GetType("System::Boolean");
    case SqlDbType::Char:
        return System::Type::GetType("System::String");
    case SqlDbType::DateTime:
        return System::Type::GetType("System::DateTime");
    case SqlDbType::Decimal:
        return System::Type::GetType("System::Decimal");
    case SqlDbType::Float:
        return System::Type::GetType("System::Double");
    case SqlDbType::Image:
        return System::Type::GetType("System::Object");
    case SqlDbType::Int:
        return System::Type::GetType("System::Int32");
    case SqlDbType::Money:
        return System::Type::GetType("System::Decimal");
    case SqlDbType::NChar:  
        return System::Type::GetType("System::String");
    case SqlDbType::NText:
        return System::Type::GetType("System::String");
    case SqlDbType::NVarChar:
        return System::Type::GetType("System::String");
    case SqlDbType::Real:
        return System::Type::GetType("System::Single");
    case SqlDbType::SmallDateTime:
        return System::Type::GetType("System::DateTime");
    case SqlDbType::SmallInt:
        return System::Type::GetType("System::Int16");
    case SqlDbType::SmallMoney:
        return System::Type::GetType("System::Decimal");
    case SqlDbType::Text:
        return System::Type::GetType("System::String");
    case SqlDbType::Timestamp:
        return System::Type::GetType("System::Object");
    case SqlDbType::TinyInt:
        return System::Type::GetType("System::Byte");
    case SqlDbType::Udt://自定义的数据类型
        return System::Type::GetType("System::Object");
    case SqlDbType::UniqueIdentifier:
        return System::Type::GetType("System::Object");
    case SqlDbType::VarBinary:
        return System::Type::GetType("System::Object");
    case SqlDbType::VarChar:
        return System::Type::GetType("System::String");
    case SqlDbType::Variant:
        return System::Type::GetType("System::Object");
    case SqlDbType::Xml:
        return System::Type::GetType("System::Object");
    default:
        return null;
        break;
    }
}

正确的是：

Type^ csharp_Field::SqlDbTypeConvertToCSharpType(SqlDbType sqlType)
{
    switch (sqlType)
    {
    case SqlDbType::BigInt:
        return System::Type::GetType("System.Int64");
    case SqlDbType::Binary:
        return System::Type::GetType("System.Object");
    case SqlDbType::Bit:
        return System::Type::GetType("System.Boolean");
    case SqlDbType::Char:
        return System::Type::GetType("System.String");
    case SqlDbType::DateTime:
        return System::Type::GetType("System.DateTime");
    case SqlDbType::Decimal:
        return System::Type::GetType("System.Decimal");
    case SqlDbType::Float:
        return System::Type::GetType("System.Double");
    case SqlDbType::Image:
        return System::Type::GetType("System.Object");
    case SqlDbType::Int:
        return System::Type::GetType("System.Int32");
    case SqlDbType::Money:
        return System::Type::GetType("System.Decimal");
    case SqlDbType::NChar:  
        return System::Type::GetType("System.String");
    case SqlDbType::NText:
        return System::Type::GetType("System.String");
    case SqlDbType::NVarChar:
        return System::Type::GetType("System.String");
    case SqlDbType::Real:
        return System::Type::GetType("System.Single");
    case SqlDbType::SmallDateTime:
        return System::Type::GetType("System.DateTime");
    case SqlDbType::SmallInt:
        return System::Type::GetType("System.Int16");
    case SqlDbType::SmallMoney:
        return System::Type::GetType("System.Decimal");
    case SqlDbType::Text:
        return System::Type::GetType("System.String");
    case SqlDbType::Timestamp:
        return System::Type::GetType("System.Object");
    case SqlDbType::TinyInt:
        return System::Type::GetType("System.Byte");
    case SqlDbType::Udt://自定义的数据类型
        return System::Type::GetType("System.Object");
    case SqlDbType::UniqueIdentifier:
        return System::Type::GetType("System.Object");
    case SqlDbType::VarBinary:
        return System::Type::GetType("System.Object");
    case SqlDbType::VarChar:
        return System::Type::GetType("System.String");
    case SqlDbType::Variant:
        return System::Type::GetType("System.Object");
    case SqlDbType::Xml:
        return System::Type::GetType("System.Object");
    default:
        return null;
        break;
    }
}

C#可以（所有功能在一个函数内完在，下面函数要是换成Lambda表达式更简洁）：

 /// <summary>
 /// 显示信息   
 /// </summary>
 /// <param name="sText"></param>
 /// <param name="sCaption"></param>
 /// <param name="bRtf"></param>
 /// <param name="FontSize">信息文本</param>
 /// <param name="sFontName"></param>
 /// 创建时间：2019-12-29        最后一次修改时间：2022-02-25
 public static string ShowDialogText(string sText, string sCaption = "",bool bRtf = false, int FontSize = 12,
     string sFontName = "微软雅黑")
 {
     
     string sResult = "";

     void RichTextBox_MouseDown(object sender, MouseEventArgs e)
     {
         if (e.Button == MouseButtons.Right)
         {
             RichTextBox rtSernder = (RichTextBox)sender;

             ContextMenu cm = new ContextMenu();

              

             MenuItem miPaste = new MenuItem();
             miPaste.Text = "粘贴";                     

             void miPaste_Click(object miPasteSender, EventArgs miPasteE)
             {
                 rtSernder.Paste();
             }
             miPaste.Click += miPaste_Click;




             MenuItem miCopy = new MenuItem();
             miCopy.Text = "复制";
             miCopy.Enabled = rtSernder.SelectionLength != 0;
             void MiCopy_Click(object miCopySender, EventArgs miCopyE)
             {
                 rtSernder.Copy();
             }
             miCopy.Click += MiCopy_Click;




             void MiBaidu_Click(object miBaiduSender, EventArgs miBaiduE)
             {
                 if (rtSernder.SelectedText.Trim() != "")
                 {
                     LIEAuto.ie_baidu_query(rtSernder.SelectedText.Trim());

                 }
             }

             MenuItem miBaidu = new MenuItem();
             miBaidu.Text = "百度";
             miBaidu.Enabled = rtSernder.SelectionLength != 0;
             miBaidu.Click += MiBaidu_Click;




             void MiRead_Click(object MiReadSender, EventArgs MiReadE)
             {
                 if (rtSernder.SelectedText.Trim() != "")
                 {
                     LSpeech.Speak(rtSernder.SelectedText);
                 }
             }

             MenuItem miRead = new MenuItem();
             miRead.Text = "朗读";
             miRead.Enabled = rtSernder.SelectionLength != 0;
             miRead.Click += MiRead_Click;


             cm.MenuItems.Add(miPaste);
             cm.MenuItems.Add(miCopy);
             cm.MenuItems.Add(miBaidu);
             cm.MenuItems.Add(miRead);


             rtSernder.ContextMenu = cm;

             /*

             int nOldStart = rtSernder.SelectionStart;
             int nOldLength = rtSernder.SelectionLength;

             rtSernder.LockPaint(true);
             rtSernder.SelectAll();
             rtSernder.ForeColor = RandomColor();
             rtSernder.SelectionLength = 0;

             rtSernder.SelectionStart = nOldStart;
             rtSernder.SelectionLength = nOldLength;

             rtSernder.LockPaint(false);
             */



         }          
     }

     void RichTextBox_MouseDoubleClick(object sender, MouseEventArgs e)
     {
         RichTextBox sRTB = (RichTextBox)sender;
        
         string sSelect = sRTB.SelectedText.Trim();

         if (sSelect.Length  != 0)
         {
             if (sCaption.IndexOf("五笔") != -1)
             {
                 sRTB.Copy();                  
                 LIEAuto.ie_52wubi_query(sSelect);                         
             }
             else
             {
                 //父控件已处理
             }
         }
     }

     Form f = new Form();
     RichTextBox rtb = new RichTextBox();
     rtb.Parent = f;
     //rtb.BackColor = Color.Black;
     //rtb.ForeColor = lg.RandomColor();

     rtb.ForeColor = Color.DeepSkyBlue;
     rtb.MouseDown += RichTextBox_MouseDown;
     rtb.MouseDoubleClick += RichTextBox_MouseDoubleClick;
     rtb.DetectUrls = true;

     //rtb.ReadOnly = true;


     if (bRtf)
         rtb.Rtf = sText;
     else
     {      
         rtb.Text = sText;
         rtb.SelectAll();
         rtb.SelectionFont = new Font(sFontName, FontSize,FontStyle.Bold);
         rtb.SelectionLength = 0;
     }

     rtb.Dock = DockStyle.Fill;
     f.StartPosition = FormStartPosition.CenterScreen;
     f.Height = 618;
     f.Width = 1000;
     //lf.WindowState = FormWindowState.Maximized;

     void F_FormClosed(object fSender, FormClosedEventArgs fE)
     {
         sResult = rtb.Text;
     }


     f.FormClosed += F_FormClosed;

     if (sCaption == "")
         f.Text = "显示信息";
     else
         f.Text = sCaption;
     try
     {
         f.ShowDialog();
     }
     finally
     {
         rtb.Dispose();
         f.Dispose();
     }

     return sResult;
      
 }

C++CLI变成这样：

ref class ShowDialogForm : Form
{
public:
    RichTextBox^    rtb;
    String^         sText;
    String^         sCaption;
    bool bRtf;      int FontSize;
    String^         sFontName;
    String^         sResult;
public:

    void miPaste_Click(System::Object^ miPasteSender, System::EventArgs^ miPasteE)
    {
        rtb->Paste();
    }
    void MiCopy_Click(System::Object^ miCopySender, System::EventArgs^ miCopyE)
    {
        rtb->Copy();
    }


    void MiBaidu_Click(System::Object^ miBaiduSender, System::EventArgs^ miBaiduE)
    {
        if (rtb->SelectedText->Trim() != "")
        {
            gce::ie_baidu_query(rtb->SelectedText->Trim());

        }
    }

    void MiRead_Click(System::Object^ MiReadSender, System::EventArgs^ MiReadE)
    {
        if (rtb->SelectedText->Trim() != "")
        {
            gce::sp_Speak(rtb->SelectedText);
        }
    }

    void RichTextBox_MouseDown(Object^ sender, MouseEventArgs^ e)
    {
        if (e->Button == Forms::MouseButtons::Right)
        {
           

            Forms::ContextMenu^ cm = gcnew Forms::ContextMenu();



            MenuItem^ miPaste = gcnew MenuItem();
            miPaste->Text = "粘贴";

     
            miPaste->Click += gcnew System::EventHandler(this, &ShowDialogForm::miPaste_Click);
       


            MenuItem^ miCopy = gcnew MenuItem();
            miCopy->Text = "复制";
            miCopy->Enabled = rtb->SelectionLength != 0;
    
            miCopy->Click += gcnew System::EventHandler(this, &ShowDialogForm::MiCopy_Click); 





            MenuItem^ miBaidu = gcnew MenuItem();
            miBaidu->Text = "百度";
            miBaidu->Enabled = rtb->SelectionLength != 0;
            miBaidu->Click += gcnew System::EventHandler(this, &ShowDialogForm::MiBaidu_Click);
             


 

            MenuItem^ miRead = gcnew MenuItem();
            miRead->Text = "朗读";
            miRead->Enabled = rtb->SelectionLength != 0;
            miRead->Click +=  gcnew System::EventHandler(this, &ShowDialogForm::MiRead_Click);

            cm->MenuItems->Add(miPaste);
            cm->MenuItems->Add(miCopy);
            cm->MenuItems->Add(miBaidu);
            cm->MenuItems->Add(miRead);


            rtb->ContextMenu = cm;


            //int nOldStart = rtSernder->SelectionStart;
            //int nOldLength = rtSernder->SelectionLength;

            //rtSernder->LockPaint(true);
            //rtSernder->SelectAll();
            //rtSernder->ForeColor = RandomColor();
            //rtSernder->SelectionLength = 0;

            //rtSernder->SelectionStart = nOldStart;
            //rtSernder->SelectionLength = nOldLength;

            //rtSernder->LockPaint(false);
        } 
    }


    void RichTextBox_MouseDoubleClick(Object^ sender, MouseEventArgs^ e)
    {
  
        String^ sSelect = rtb->SelectedText->Trim();

        if (sSelect->Length != 0)
        {
            if (sCaption->IndexOf("五笔") != -1)
            {
                rtb->Copy();
                gce::ie_52wubi_query(sSelect);
            }
            else
            {
                //父控件已处理
            }
        }  
    }

    void F_FormClosed(Object^ fSender, FormClosedEventArgs^ fE)
    {
        sResult = rtb->Text;
    }
    ShowDialogForm(String^ sText, String^ sCaption, bool bRtf, 
        int FontSize, String^ sFontName)
    {
        this->sText = sText;
        this->sCaption = sCaption;
        this->bRtf = bRtf;
        this->FontSize = FontSize;
        this->sFontName = sFontName;
    }

    String^ ShowDialogText()
    {
        String^ sResult = "";


        rtb = gcnew RichTextBox();
        rtb->Parent = this;
        //rtb->BackColor = Color->Black;
        //rtb->ForeColor = lg->RandomColor();

        rtb->ForeColor = Color::DeepSkyBlue;
        rtb->MouseDown += gcnew System::Windows::Forms::MouseEventHandler(this, &ShowDialogForm::RichTextBox_MouseDown);
        rtb->MouseDoubleClick += gcnew System::Windows::Forms::MouseEventHandler(this, &ShowDialogForm::RichTextBox_MouseDoubleClick);
        rtb->DetectUrls = true;

        //rtb->ReadOnly = true;


        if (bRtf)
            rtb->Rtf = sText;
        else
        {
            rtb->Text = sText;
            rtb->SelectAll();
            rtb->SelectionFont = gcnew Drawing::Font(sFontName, FontSize, FontStyle::Bold);
            rtb->SelectionLength = 0;
        }

        rtb->Dock = DockStyle::Fill;
        StartPosition = FormStartPosition::CenterScreen;
        Height = 618;
        Width = 1000;
        //lf->WindowState = FormWindowState->Maximized;


        FormClosed += gcnew System::Windows::Forms::FormClosedEventHandler(this, &ShowDialogForm::F_FormClosed);

        if (sCaption == "")
            Text = "显示信息";
        else
            Text = sCaption;
        try
        {
            ShowDialog();
        }
        finally
        {
            Close();
        }

        return sResult;
    }
};


String^ global_clr_extend::ShowDialogText(String^ sText, String^ sCaption, bool bRtf,
    int FontSize, String^ sFontName)
{    
    ShowDialogForm^ f = gcnew ShowDialogForm(sText, sCaption, bRtf, FontSize, sFontName);

    return f->ShowDialogText();
}


String^ global_clr_extend::ShowDialogText(String^ sText, String^ sCaption, bool bRtf, int FontSize)
{
    return ShowDialogText(sText, sCaption, bRtf, FontSize, "微软雅黑");
     
}

String^ global_clr_extend::ShowDialogText(String^ sText, String^ sCaption, bool bRtf)
{
    return ShowDialogText(sText, sCaption, bRtf, 12, "微软雅黑");
}

String^ global_clr_extend::ShowDialogText(String^ sText, String^ sCaption)
{
    return ShowDialogText(sText, sCaption, false, 12, "微软雅黑");
}

String^ global_clr_extend::ShowDialogText(String^ sText)
{
    return ShowDialogText(sText, "", false, 12, "微软雅黑");
}

C++ CLI 不支持局部的Lambda表达式，函数不支持默认参数， ref class 成员变量不支持原生 class，原生class成员变量又不支持ref class，简直是怪胎。