Manage XML Schema File ( add element - Attribute)

• Download manage_xsd1.zip - 3.7 KB

Introduction

in that Article i will manage XML Schema File by selecting all the schema file elements and
display them in DropDownList , Adding Elements to root element and select elemet to add an
attributes to the selected element

Background

First you must know some information abut xml and xmls schema .

Using the code

public void load_element()that funcation load the element and display them in
DropDownList

 
public void load_element()
   {
    DropDownList_elements.Items.Clear();    
    XmlTextReader reader = new XmlTextReader(Server.MapPath("person.xsd"));
    // declare new xmlschema variable

    XmlSchema my_xmlschema = new XmlSchema();
    // read xsd file

    my_xmlschema = XmlSchema.Read(reader, null);
    reader.Close();
    // declare new xmlschema Element

    XmlSchemaElement my_xmlschemaelement = new XmlSchemaElement();
    // count how many item in XmlSchema 

    int counter = my_xmlschema.Items.Count;
    // select the root Element in the xsd file in that case "person"

    // so we loop in all element till we get "person" element

    for (int i = 0; i < counter; i++)
       {
         XmlSchemaElement current_element = (XmlSchemaElement)my_xmlschema.Items[i];
         // if the current elemet is the root element "person"

         if (current_element.Name.ToString() == "person")
           {
             // go in complextype

             XmlSchemaComplexType current_element_complexType = (XmlSchemaComplexType)current_element.SchemaType;
             // go in Sequence

             XmlSchemaSequence current_elemen_sequence = (XmlSchemaSequence)current_element_complexType.Particle;
             // loop in Sequence

               foreach ( XmlSchemaObject my_XmlSchemaObject in current_elemen_sequence.Items)
                 {
                   XmlSchemaElement my_XmlElement = (XmlSchemaElement)my_XmlSchemaObject;
                   // get the element type name

                   string[] TypeName = my_XmlElement.SchemaTypeName.ToString().Split(':');
                   // add the element name and type to DropDownList

                   DropDownList_elements.Items.Add(my_XmlElement.Name.ToString() + " " + "-" + " " + TypeName[2]);
                  
        }
            }
                 }

    DropDownList_elements.DataBind();

   }

Button_add_element : that button get the element name from TextBox and type from
drodownlist and add it in root element then call the void load_element() funcation to load the
element aftar adding the new element .

 
protected void Button_add_element_Click(object sender, EventArgs e)

{

     XmlTextReader reader = new XmlTextReader(Server.MapPath("person.xsd"));
     // declare new xmlschema variable

     XmlSchema my_xmlschema = new XmlSchema();
     // read xsd file

     my_xmlschema = XmlSchema.Read(reader, null);
     reader.Close();
     // declare new xmlschema Element

     XmlSchemaElement my_xmlschemaelement = new XmlSchemaElement();
     // count how many item in XmlSchema 

     int counter = my_xmlschema.Items.Count;
     // select the root Element in the xsd file in that case "person"

     // so we loop in all element till we get "person" element

    for (int i = 0; i < counter; i++)
    {
      // save the current element in new xml variable 

      XmlSchemaElement current_element = (XmlSchemaElement)my_xmlschema.Items[i];
      // if the current elemet is the root element "person"

      if (current_element.Name.ToString() == "person")
         {
            // go in complextype

            XmlSchemaComplexType current_element_complexType = (XmlSchemaComplexType)current_element.SchemaType;
            // go in Sequence

            XmlSchemaSequence current_elemen_sequence = (XmlSchemaSequence)current_element_complexType.Particle;
            // create new element

            XmlSchemaElement new_element = new XmlSchemaElement();
            // set the nme of the new element

            new_element.Name = TextBox_element_name.Text;
            // set the type of the new element 

            new_element.SchemaTypeName = new XmlQualifiedName(DropDownList_type.SelectedValue.ToString(), "http://www.w3.org/2001/XMLSchema);">http://www.w3.org/2001/XMLSchema);

           // add the new element to our current elemen sequence

           XmlSchemaObject new_element_object = (XmlSchemaObject)new_element;
           current_elemen_sequence.Items.Add(new_element_object);
          }
      }
    // careat file stream 

    FileStream writer = new FileStream(Server.MapPath("person.xsd"), System.IO.FileMode.Create);
    // wrire the new schema 

    my_xmlschema.Write(writer);
    // close the file stream

    writer.Close();
    // load the xsd file after adding new element

    load_element();
}

  

Button_add_attribute : that button get element name from textbox and type from
drodownlist and add the attribute to the selected element and cheak if the selected element dont have attribute creat new complex type and add the attribute in and if the element have
an attribut add the element in the current complex type.

protected void Button_add_attribute_Click(object sender, EventArgs e)

{
     XmlTextReader reader = new XmlTextReader(Server.MapPath("person.xsd"));
     // declare new xmlschema variable

     XmlSchema my_xmlschema = new XmlSchema();
     // read xsd file

     my_xmlschema = XmlSchema.Read(reader, null);
     reader.Close();
     // declare new xmlschema Element

     XmlSchemaElement my_xmlschemaelement = new XmlSchemaElement();
     // count how many item in XmlSchema 

     int counter = my_xmlschema.Items.Count;
     // select the root Element in the xsd file in that case "person"

     // so we loop in all element till we get "person" element

    for (int i = 0; i < counter; i++)
      {
         // save the current element in new xml variable 

         XmlSchemaElement current_element = (XmlSchemaElement)my_xmlschema.Items[i];
         // if the current elemet is the root element "person"

           if (current_element.Name.ToString() == "person")
              {
                  // go in complextype

                  XmlSchemaComplexType current_element_complexType = (XmlSchemaComplexType)current_element.SchemaType;
                 // go in Sequence

                 XmlSchemaSequence current_elemen_sequence = (XmlSchemaSequence)current_element_complexType.Particle;
                 // loop in root element "person" sequence items

                 foreach (XmlSchemaObject my_XmlSchemaObject in current_elemen_sequence.Items)
                     {
                        // convert the XmlSchemaObject to XmlSchemaElement

                        // so we can access the element properties like name

                        XmlSchemaElement my_XmlElement = (XmlSchemaElement)my_XmlSchemaObject;
                        string[] ElementName = DropDownList_elements.SelectedValue.ToString().Split(' ');
                        // use if condition to get in the selected element

                            if (my_XmlElement.Name.ToString() == ElementName[0])
                                {
                                   // is thar any complex type oready in the selected element

                                       if (my_XmlElement.SchemaType == null )
                                           {
                                               // create new XmlSchemaComplexType

                                               XmlSchemaComplexType new_XmlSchemaComplexType = new XmlSchemaComplexType();
                                               // ctreat new Attribute

                                               XmlSchemaAttribute new_XmlSchemaAttribute = new XmlSchemaAttribute();
                                               // set the new Attribute name

                                                new_XmlSchemaAttribute.Name = TextBox_Attribute.Text;
                                                // set the new Attribute type

                                                new_XmlSchemaAttribute.SchemaTypeName = new XmlQualifiedName(DropDownList_Attribute.SelectedValue.ToString(), "http://www.w3.org/2001/XMLSchema);">http://www.w3.org/2001/XMLSchema);

                                                // convert new_XmlSchemaAttribute variable to XmlSchemaObject so we can add the Attribute

                                                // to the new complex type

                                                XmlSchemaObject new_XmlSchemaAttribute_object = (XmlSchemaObject)new_XmlSchemaAttribute;
                                                // add the new Attribute to the new complex type

                                                new_XmlSchemaComplexType.Attributes.Add(new_XmlSchemaAttribute_object);
                                                // add the new ComplexType to the selected element

                                                my_XmlElement.SchemaType = new_XmlSchemaComplexType;
                                              }
                                              else
                                              {
                                                  // go in selected element complextype

                                                  XmlSchemaComplexType select_elemet_XmlSchemaComplexType = (XmlSchemaComplexType)my_XmlElement.SchemaType;
                                                   // ctreat new Attribute

                                                  XmlSchemaAttribute new_XmlSchemaAttribute = new XmlSchemaAttribute();
                                                   // set the new Attribute name

                                                   new_XmlSchemaAttribute.Name = TextBox_Attribute.Text;
                                                   // set the new Attribute type

                                                   new_XmlSchemaAttribute.SchemaTypeName = new XmlQualifiedName(DropDownList_Attribute.SelectedValue.ToString(), "http://www.w3.org/2001/XMLSchema);">http://www.w3.org/2001/XMLSchema);

                                                  // convert new_XmlSchemaAttribute variable to XmlSchemaObject so we can add the Attribute

                                                 // to the new complex type

                                                 XmlSchemaObject new_XmlSchemaAttribute_object = (XmlSchemaObject)new_XmlSchemaAttribute;
                                                 // add the new Attribute to the selected element complex type

                                                  select_elemet_XmlSchemaComplexType.Attributes.Add(new_XmlSchemaAttribute_object);
                                               }
                                       }
                             }
                 }
        }

   // careat file stream 

   FileStream writer = new FileStream(Server.MapPath("person.xsd"), System.IO.FileMode.Create);
   // wrire the new schema 

   my_xmlschema.Write(writer);
   // close the file stream

   writer.Close(); 
}

 
protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
           load_element();
     }
}

Points of Interest

main idea of controling and manageing XML Schema Elements.