如何通过C#在SharePoint 2007中测试查找列表项，并在缺少时添加它？

嗨，谢谢你的关注

背景 尝试向查找列添加值时遇到问题

我正在使用SharePoint 2007，该应用程序必须在.NET 2.0中运行。语言是C#某些查找列将允许多个值。

问题: 使用C#，我如何做#的2-4项：

尝试将列表项添加到SP列表

对于任何查找列，请检查它们引用的SP列表，以查看该列表是否包含我尝试添加的值

如果该值在查找列表中不存在，请添加它

将新添加的查找值与我最初尝试添加的列表项相关联

当然，我已经在谷歌上搜索过了，但我还是被卡住了。下面是一些来自微软的代码，这是一个开始，但它仍然不能让我继续（没有评论，对我来说也不直观）：

即使有微软的例子，我也不知道如何真正做到这一点

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非常感谢您的帮助。

如果我收到“StackOverflow不是一个租用编码器”的评论，我还想补充一点：我必须在远程连接的SP服务器上开发，由于IT部门正在使用某种插件，我无法调试。这就像蒙着眼睛编码一样。再次感谢您的帮助。谢谢sga101！我会查一查。

//untested pseudocode - hope this points you in the right direction

SPList lookupItems = ... // add code here
SPList list = ... // add code here
string lookupFieldName = "LookupValue"; // change to the appropriate value

foreach(SPListItem item in list.Items)
{ 
    string value = (string)item[lookupFieldName];
    if(value.Contains("#")) // value containing hash is most likely a lookup value already
    {
         // use SPFieldLookupValue to get actual value
         SPFieldLookupValue currentValue = new SPFieldLookupValue(value);
         value = currentValue.LookupValue;
    }

    // Get the list item (you will need this to find out its id value)
    SPListItem lookupItem = GetLookupListItem(lookupList, value);
    if(lookupItem == null)
    {
        //If it doesn't exist, create it
        lookupItem = AddNewLookupItem(lookupList, value);
        SPFieldLookupValue lookupValue = new      SPFieldLookupValue(lookupItem.ID,value));
        item["LookupValue"] = lookupValue.ToString();
        item.Update();
    }
}
SPListItem GetLookupListItem(SPList lookupList, string value)
{
    // iterate through list to find item
    // use a list query if the list is too big for this to perform well (see here: http://msdn.microsoft.com/en-us/library/ie/ms456030.aspx)
    foreach(SPListItem item in lookupList)
    {
        string itemValue = (string)item[0]; // assuming lookup list has one field of type string containing lookup value
        if(value == itemValue)
        {
            return item;
        }
    }
    return null;
}

SPListItem AddLookupListItem(SPList list, string value)
{
    SPListItem newItem = list.Add();
    newItem[0] = value;// assuming lookup list has one field of type string containing lookup value
    newItem.Update();
}

//untested pseudocode - hope this points you in the right direction

SPList lookupItems = ... // add code here
SPList list = ... // add code here
string lookupFieldName = "LookupValue"; // change to the appropriate value

foreach(SPListItem item in list.Items)
{ 
    string value = (string)item[lookupFieldName];
    if(value.Contains("#")) // value containing hash is most likely a lookup value already
    {
         // use SPFieldLookupValue to get actual value
         SPFieldLookupValue currentValue = new SPFieldLookupValue(value);
         value = currentValue.LookupValue;
    }

    // Get the list item (you will need this to find out its id value)
    SPListItem lookupItem = GetLookupListItem(lookupList, value);
    if(lookupItem == null)
    {
        //If it doesn't exist, create it
        lookupItem = AddNewLookupItem(lookupList, value);
        SPFieldLookupValue lookupValue = new      SPFieldLookupValue(lookupItem.ID,value));
        item["LookupValue"] = lookupValue.ToString();
        item.Update();
    }
}
SPListItem GetLookupListItem(SPList lookupList, string value)
{
    // iterate through list to find item
    // use a list query if the list is too big for this to perform well (see here: http://msdn.microsoft.com/en-us/library/ie/ms456030.aspx)
    foreach(SPListItem item in lookupList)
    {
        string itemValue = (string)item[0]; // assuming lookup list has one field of type string containing lookup value
        if(value == itemValue)
        {
            return item;
        }
    }
    return null;
}

SPListItem AddLookupListItem(SPList list, string value)
{
    SPListItem newItem = list.Add();
    newItem[0] = value;// assuming lookup list has one field of type string containing lookup value
    newItem.Update();
}