c# - 最高效的 C# SharePoint 列表迭代

Question

我正在使用 C# 为 SharePoint webpart 编写一些自定义代码。具体来说，我正在做一个测验，我的主要观点是解决包含问题、答案选择和正确答案的列表。

在测验的最后阶段，我需要将用户选择的答案与列表中的正确答案进行比较。目前，我正在执行以下操作来检查每个问题是否正确，我认为这不是很有效，因为它会遍历每个问题。有没有专门针对 SPList foreach 循环的方法更有效？

                // 1. Store questions and answers in class
                    List<submittedAnswers> answeredQuestions = new List<submittedAnswers>();

                // 2. From POST pull answered question IDs and answer IDs (which correspond to the question primary key and answer choice number both stored in the list)
                    // INSERT BEAUTFIUL AND EFFICIENT WHILE LOOP HERE

                // 3. Loop through each question is list, if question was given, test if correct/incorrect
                using (SPWeb myWeb = mySite.OpenWeb())
                {
                    SPList answerList = myWeb.Lists[questionList];
                    foreach (SPListItem quizEntry in answerList.Items)
                    {
                        int pullAnswerId = int.Parse(quizEntry["Answer"].ToString()); // Pull answer number from list
                        int pullQuestionId = int.Parse(quizEntry["ID"].ToString()); // Pull primary key of question

                        submittedAnswers result = answeredQuestions.Find(delegate(submittedAnswers e) { return e.questionId == int.Parse(quizEntry["ID"].ToString()); });
                        if (result != null)
                        {
                            if (result.responseId != pullAnswerId) // If the response was different from the answer
                                incorrectAnswers++;
                            else
                                correctAnswers++;
                        }
                    }
                }
                // C# quiz grading magic here....

Answer 1

如果您需要访问列表中的每一项，那么使用 foreach 是完全可以的:

SPList answerList = myWeb.Lists[questionList];
foreach (SPListItem quizEntry in answerList.Items)
{
    // todo...
}

通常，大多数人需要处理列表中的项目子集。在这种情况下，您很可能希望从列表中检索项目的子集，然后进行处理。例如，通过使用 SPQuery 和 SPList.GetItems ( code from the full example here ):

// Build a query.
SPQuery query = new SPQuery();
query.Query = string.Concat(
                    "<Where><Eq>",
                        "<FieldRef Name='Status'/>",
                        "<Value Type='CHOICE'>Not Started</Value>",
                    "</Eq></Where>",
                    "<OrderBy>",
                        "<FieldRef Name='DueDate' Ascending='TRUE' />",
                        "<FieldRef Name=’Priority’ Ascending='TRUE' />", 
                    "</OrderBy>");                    

query.ViewFields = string.Concat(
                          "<FieldRef Name='AssignedTo' />",
                          "<FieldRef Name='LinkTitle' />",
                          "<FieldRef Name='DueDate' />",
                          "<FieldRef Name='Priority' />");

query.ViewFieldsOnly = true; // Fetch only the data that we need.

// Get data from a list.
string listUrl = web.ServerRelativeUrl + "/lists/tasks";
SPList list = web.GetList(listUrl);
SPListItemCollection items = list.GetItems(query);

仅供引用...这是一个很好的链接，可以查看其他一些选项:https://www.nothingbutsharepoint.com/sites/devwiki/SP2007Dev/Pages/Accessing%20list%20items%20using%20the%20object%20model.aspx

SharePoint 有很多工具。始终值得确定哪种工具适合手头的工作。 :)