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C#foreach超出范围

由于某种原因,我的阵列summary,subjectdate得到use of unassigned local variable错误.有谁知道最近发生了什么?

    int count = 0;
    string[] summary;
    string[] subject;
    string[] date;

    foreach (SyndicationItem item in feed.Items)
    {
        subject[count] = item.Title.Text;
        date[count] = item.PublishDate.DateTime.ToString();

        summary[count] = item.Summary.Text;
        list.InnerHtml += "<a href=\"#\" onclick\"showArticle(" + count + ");\"><li id=\"post" + count + "\"><b>" + subject[count] + "</b><br>" +
           "<p id=\"posted-date\">Posted on: " + date[count] + "</p>" + "</li></a>";
        count++; 
    } 
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c# arrays

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