【问题标题】:App_Code files are ignored (Microsoft Visual Web Developer 2010 error)App_Code 文件被忽略(Microsoft Visual Web Developer 2010 错误)
【发布时间】:2011-02-19 15:54:22
【问题描述】:

我在 Microsoft Visual Web Developer 2010 的 App_Code 文件夹中有一个“Connection.cs”文件,但它提醒我一个错误:

类型或命名空间名称 找不到“连接”(是 您缺少 using 指令或 汇编参考?)

('Connection'是Connection.cs文件中的类名)

我对引用文件不是很了解,也看不懂MSDN中的错误帮助说明。我该如何解决?

编辑:

Connection.cs 文件:

public class Connection
{
    public void Insert(OleDbConnection cnctn, string tableName, string[] inputs, char[] types)
    {
        // new OleDbConnection(@"Provider=Microsoft.Jet.OleDb.4.0; Data Source=" + this.dbPath);

        string sql = "INSERT INTO " + tableName + " VALUES (";
        for (int i = 0; i < inputs.Length - 1; i++)
            sql += "@p" + i + ",";
        sql += "@p" + (inputs.Length - 1) + ")";

        cnctn.Open();
        OleDbCommand cmnd = new OleDbCommand(sql, cnctn);

        for (int i = 0; i < inputs.Length; i++)
        {
            if (types[i] == 'c')
                cmnd.Parameters.Add("@p" + i, OleDbType.VarChar);
            else if (types[i] == 'n')
                cmnd.Parameters.Add("@p" + i, OleDbType.VarNumeric);
            cmnd.Parameters["@p" + i].Value = inputs[i];
        }

        cmnd.ExecuteNonQuery();
    }

    public bool DoesExists(OleDbConnection cnctn, string tableName, string condition)
    {
        // new OleDbConnection(@"Provider=Microsoft.Jet.OleDb.4.0; Data Source=" + this.dbPath);
        cnctn.Open();
        OleDbCommand cmnd = new OleDbCommand("SELECT * FROM " + tableName + " WHERE " + condition, cnctn);
        bool temp = cmnd.ExecuteReader().Read();
        cnctn.Close();
        return temp;
    }

    public DataSet SetDataSet(OleDbConnection cnctn, string tableName, string sql)
    {
        cnctn.Open();
        DataSet ds = new DataSet();
        OleDbCommand cmnd = new OleDbCommand(sql, cnctn);
        OleDbDataAdapter da = new OleDbDataAdapter(cmnd);
        da.Fill(ds, tableName);
        cnctn.Close();
        return ds;
    }

    public void Execute(OleDbConnection cnctn, string sql)
    {
        cnctn.Open();
        OleDbCommand cmnd = new OleDbCommand(sql, cnctn);
        cmnd.ExecuteNonQuery();
        cnctn.Close();
    }
}

使用该类的文件之一:

public partial class register : System.Web.UI.Page
{
    private string[] errors = new string[5];
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.Form["submit"] != null)
        {
            string[] inputs = { 
                Request.Form["userName"],
                Request.Form["names"],
                Request.Form["password"],
                Request.Form["email"],
                Request.Form["birthDate"]
            };
            string[] regexString = {
                @"[^&<>\n]+( [^&<>\n]+)*",
                @"['\-A-z]{2,}( ['\-A-z]{2,})+",
                ".{5,}",
                @"\w+@\w+(\.\w+)+",
                @"(\d{4}-\d\d-\d\d)?"
            };
            char[] types = { 'u', 'i', 'i', 'i', 'd' };
            bool flag = true;
            OleDbConnection cnct = new OleDbConnection(@"Provider=Microsoft.Jet.OleDb.4.0; Data Source=" + Server.MapPath("App_Data/WMUdb.accdb"));
            for (int i = 0; i < inputs.Length; i++)
            {
                if (!(new Validation(inputs[i], regexString[i], types[i], cnct, "members").isValid()))//this is another class frome the App_Code, with the same problem.
                {
                    //error alert
                    flag = false;
                }
            }
            if (flag)
            {
                string[] values = new string[6];
                for (int i = 0; i < inputs.Length - 1; i++)
                    values[i] = inputs[i];
                values[5] = "1";
                Connection cnctn = new Connection();
                cnctn.Insert(cnct, "members", values, new char[6] { 'c', 'c', 'c', 'c', 'c', 'n' });

                Session["userName"] = inputs[0];
                Session["adminLevel"] = 1;
                Response.Redirect("homepage.aspx");
            }
        }
    }
}

第二次编辑:

我应该提一下,当我创建项目时,App_Code 文件不是自动创建的,而是手动添加的——我使用“添加项目...”创建了一个具有该名称的文件夹,并在其中添加了“Connection.cs”就是这样。

【问题讨论】:

  • 你的课是公开的吗?并正确声明?
  • 是Web Site project 还是Web Application project?

标签: c# .net asp.net visual-studio-2010 app-code


【解决方案1】:

使用namespaces,卢克!

(两个文件都是最好的情况)

【讨论】:

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