SPField和SPFieldMultiChoice的用法

单选:

         

   SPFieldChoice s = list.Fields["案例所属"] as SPFieldChoice;   

   foreach (string c in s.Choices)

       {   

              ddlTo.Items.Add(c);  //用于下拉菜单 

        }

 

多选:

                 

Code     SPFieldMultiChoice ss = list.Fields["分类"] as SPFieldMultiChoice;
        foreach (string cc in ss.Choices)    

          {      

                  ckType.Items.Add(cc);//用于多选的checkboxList   

          }

 

多选字段值的获得

 

　　SPFieldMultiChoice chInjury = (SPFieldMultiChoice)m_listItem.Fields["Injury"];

      string valueInjury = chInjury.GetFieldValueAsText(m_listItem["Injury"]);   

      lbInjury.Text = valueInjury.Replace(", ", "<br/>");

 

List中创建MulitChoice类型的Field

MulitChoice类型的Field在List中是常用的,它可以用来标记一个Item的Tag,使用户在创建Item时适当的Tag标签,是很好的管理和检索标记;

 

在创建Field时,我们需要对MulitChoice类型的Field做相应的处理;下面我们就来创建一个MulitChoice类型的Field;

privatestring[] mTagValue = newstring[] {"Asp.Net", "Microsoft", "C#"};
privatestring mListName = "Article";

publicvoid MakeList(string listName)
{
    using (SPSite site = new SPSite(listName))
    {
        using (SPWeb web = site.OpenWeb())
        {
            SPList list = web.GetList(listName);
            if (list.Fields.ContainsField("Tag"))
            {
                SPField tagField = list.Fields["Tag"];
                if (!tagField.Type.Equals(SPFieldType.MultiChoice))
                {
                    tagField.Type = SPFieldType.MultiChoice;
                    tagField.Update();
                }
                SPFieldMultiChoice tagChoice = (SPFieldMultiChoice)tagField;
                if (tagChoice.Choices.Count == 0)
                {
                    MakeTagValue(list);
                }
            }
            else
            {
                list.Fields.Add("Tag", SPFieldType.MultiChoice, false);
                MakeTagValue(list);
            }
        }
    }
}

private string[] mTagValue = new string[] {"Asp.Net", "Microsoft", "C#"}; private string mListName = "Article"; public void MakeList(string listName) { using (SPSite site = new SPSite(listName)) { using (SPWeb web = site.OpenWeb()) { SPList list = web.GetList(listName); if (list.Fields.ContainsField("Tag")) { SPField tagField = list.Fields["Tag"]; if (!tagField.Type.Equals(SPFieldType.MultiChoice)) { tagField.Type = SPFieldType.MultiChoice; tagField.Update(); } SPFieldMultiChoice tagChoice = (SPFieldMultiChoice)tagField; if (tagChoice.Choices.Count == 0) { MakeTagValue(list); } } else { list.Fields.Add("Tag", SPFieldType.MultiChoice, false); MakeTagValue(list); } } } }

 

 

这里我们需要一个MakeTagValue这个方法对我们创建的Field添加我们需要的Choice;需要对Field的SchemaXml进行相应的操作;

 

privatevoid MakeTagValue(SPList list)
{
    try
    {
        SPField field = list.Fields["Tag"];
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.LoadXml(field.SchemaXml);

        if(xmlDoc.GetElementsByTagName("CHOICES").Count == 0)
        {
            XmlElement xmlRoot = xmlDoc.CreateElement("CHOICES");
            xmlDoc.FirstChild.AppendChild(xmlRoot);
        }
        foreach (string tagValue in mTagValue)
        {
            XmlElement xmle = xmlDoc.CreateElement("CHOICE");
            xmle.InnerText = tagValue;
            xmlDoc.GetElementsByTagName("CHOICES")[0].AppendChild(xmle);
        }
        field.SchemaXml = xmlDoc.OuterXml;
        field.Update();
    }
    catch (Exception ex)
    { }
}

private void MakeTagValue(SPList list) { try { SPField field = list.Fields["Tag"]; XmlDocument xmlDoc = new XmlDocument(); xmlDoc.LoadXml(field.SchemaXml); if(xmlDoc.GetElementsByTagName("CHOICES").Count == 0) { XmlElement xmlRoot = xmlDoc.CreateElement("CHOICES"); xmlDoc.FirstChild.AppendChild(xmlRoot); } foreach (string tagValue in mTagValue) { XmlElement xmle = xmlDoc.CreateElement("CHOICE"); xmle.InnerText = tagValue; xmlDoc.GetElementsByTagName("CHOICES")[0].AppendChild(xmle); } field.SchemaXml = xmlDoc.OuterXml; field.Update(); } catch (Exception ex) { } }

 

 

在这里我就不截取Field的SchemaXml的代码了,有兴趣的读者可以使用你们的编辑器, 写一个Demo看看里面的结构;