c# - "Compile with/main to specify the type that contains the entry point."

Question

根据下面的代码，我收到以下消息。我相当确定我得到它的“原因”，我只是不知道如何重新排列代码以移动/删除/替换导致错误的语句之一。

“使用/main 编译以指定包含入口点的类型。”

"static void Main(string[] args)" 下有一堆代码，我从 http://support.microsoft.com/kb/816112为了从自动递增中获取 ID，所以当其余代码填充 Access 数据库时，我可以让它自动递增。任何帮助表示赞赏。也欢迎使用更简单的代码获得结果的建议!

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        OleDbConnection vcon = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;data source=C:\Hazardous Materials\KinneyDatabase.accdb");

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            vcon.Open();

            try
            {
                StreamReader sr = new StreamReader(@"C:\Hazardous Materials\cities.txt");
                string line = sr.ReadLine();

                StreamReader sr2 = new StreamReader(@"C:\Hazardous Materials\drugs.txt");
                string line2 = sr2.ReadLine();

                StreamReader sr3 = new StreamReader(@"C:\Hazardous Materials\strengths.txt");
                string line3 = sr3.ReadLine();

                while (line != null)
                {
                    comboBox1.Items.Add(line);
                    line = sr.ReadLine();
                }
                while (line2 != null)
                {
                    comboBox2.Items.Add(line2);
                    line2 = sr2.ReadLine();
                }
                while (line3 != null)
                {
                    comboBox3.Items.Add(line3);
                    line3 = sr3.ReadLine();
                }
                textBox2.Text = "Date";
            }
            catch (System.Exception ex)
            {
                MessageBox.Show("Error: " + ex.Message);
            }
        }

        private static OleDbCommand cmdGetIdentity;

        [STAThread]
        static void Main(string[] args)
        {
            // Open Connection
            OleDbConnection vcon = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;data source=C:\Hazardous Materials\KinneyDatabase.accdb");

            vcon.Open();

            // If the test table does not exist then create the Table
            string strSQL;
            strSQL = "CREATE TABLE AutoIncrementTest " +
                    "(ID int identity, Description varchar(40), " +
                    "CONSTRAINT AutoIncrementTest_PrimaryKey PRIMARY KEY (ID))";

            // Command for Creating Table
            OleDbCommand cmdJetDB = new OleDbCommand(strSQL, vcon);
            cmdJetDB.ExecuteNonQuery();

            // Create a DataAdaptor With Insert Command For inserting records
            OleDbDataAdapter oleDa = new OleDbDataAdapter("Select * from AutoIncrementTest", vcon);


            // Command to Insert Records
            OleDbCommand cmdInsert = new OleDbCommand();
            cmdInsert.CommandText = "INSERT INTO AutoIncrementTest (Description) VALUES (?)";
            cmdInsert.Connection = vcon;
            cmdInsert.Parameters.Add(new OleDbParameter("Description", OleDbType.VarChar, 40, "Description"));
            oleDa.InsertCommand = cmdInsert;

            // Create a DataTable
            DataTable dtTest = new DataTable();
            oleDa.Fill(dtTest);

            DataRow drTest;

            // Add Rows to the Table
            drTest = dtTest.NewRow();
            drTest["Description"] = "This is a Test Row 1";
            dtTest.Rows.Add(drTest);

            drTest = dtTest.NewRow();
            drTest["Description"] = "This is a Test Row 2";
            dtTest.Rows.Add(drTest);

            // Create another Command to get IDENTITY Value
            cmdGetIdentity = new OleDbCommand();
            cmdGetIdentity.CommandText = "SELECT @@IDENTITY";
            cmdGetIdentity.Connection = vcon;

            // Delegate for Handling RowUpdated event
            oleDa.RowUpdated += new OleDbRowUpdatedEventHandler(HandleRowUpdated);

            // Update the Data
            oleDa.Update(dtTest);

            // Drop the table
            cmdJetDB.CommandText = "DROP TABLE AutoIncrementTest";
            cmdJetDB.ExecuteNonQuery();

            // Release the Resources
            cmdGetIdentity = null;
            cmdInsert = null;
            cmdJetDB = null;
            vcon.Close();
            vcon = null;
        }
        // Event Handler for RowUpdated Event
        private static void HandleRowUpdated(object sender, OleDbRowUpdatedEventArgs e)
        {
            if (e.Status == UpdateStatus.Continue && e.StatementType == StatementType.Insert )
            {
                // Get the Identity column value
                e.Row["ID"] = Int32.Parse(cmdGetIdentity.ExecuteScalar().ToString());
                System.Diagnostics.Debug.WriteLine(e.Row["ID"]);
                e.Row.AcceptChanges();
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (comboBox1.SelectedIndex <= 0)
            {
                MessageBox.Show("All fields must be filled out to submit the form");
            }
            else if (comboBox2.SelectedIndex <= 0)
            {
                MessageBox.Show("All fields must be filled out to submit the form");
            }
            string addRemove = "";
            //string toFrom = "";

            if (radioButton1.Checked)
            {
                addRemove = "add";
                //toFrom = "to";
            }
            else if (radioButton2.Checked)
            {
                addRemove = "remove";
                //toFrom = "from";
            }
            float mgTotal = (float.Parse(textBox1.Text) * float.Parse(comboBox3.Text));

            MessageBox.Show("You have entered the following information: \n\n"
                    + "\n" + "Location: " + float.Parse(comboBox1.Text)
                    + "\n" + "Medication: " + comboBox2.Text
                    + "\n" + "Quantity " + textBox2.Text
                    + "\n" + "Strength " + float.Parse(comboBox3.Text)
                    + "\n" + "Initials: " + textBox3.Text
                    + "\n" + "Add or Remove: " + addRemove
                    + "\n" + "Date: " + textBox2.Text);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            new Form2().Show();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void toolStripMenuItem1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Produced for use by HealthDirect© \n Scripted by Geoff Bertollini. March 2012");
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            comboBox3.SelectedIndex = comboBox2.SelectedIndex;
        }
        private void textBox2_TextChanged(object sender, EventArgs e)
        {
            var date = DateTime.Now.ToString("MM/dd/yyyy");
            textBox2.Text = date;
        }

        private void label4_Click_1(object sender, EventArgs e)
        {

        }

        private void exitToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            string addRemove = "";
            string toFrom = "";

            if (radioButton1.Checked)
            {
                addRemove = "added";
                toFrom = "to";
            }
            else if (radioButton2.Checked)
            {
                addRemove = "removed";
                toFrom = "from";
            }

            float mgTotal = (float.Parse(textBox1.Text) * float.Parse(comboBox3.Text));

            string vsql = string.Format("insert into Log values " +
                    "('{0}','{1}',{2},{3},'{4}',#{5}#,'{6}','{7}')",
                    comboBox1.Text,
                    comboBox2.Text,
                    float.Parse(textBox1.Text),
                    float.Parse(comboBox3.Text),
                    textBox3.Text,
                    textBox2.Text,
                    addRemove,
                    "1"
                    );

            OleDbCommand vcom = new OleDbCommand(vsql, vcon);
            vcom.ExecuteNonQuery();
            MessageBox.Show("Date: " + textBox2.Text + "\n      Initials: " + textBox3.Text
                + "\n" + "You have " + addRemove + " " + mgTotal + " milligrams " + "\n"
                + "of " + comboBox2.Text + "\n" + toFrom + " the inventory of \n" + comboBox1.Text);

            vcom.Dispose();
        }
    }
}

Answer 1

没有一个答案开门见山。

项目的属性对话框，通过右键单击项目 Access ，有一个应用程序选项卡。在此选项卡上有一个“启动对象”下拉列表——只需选择 Visual Studio 应定位的正确类文件。只要该类文件中有 Main static void 事件，它就会以它为目标。确保 Main 是大写的。这行不通:

静态无效主要(字符串[]参数){ ... 代码 ...

这是一张图片:

在网络项目中，您可以右键单击一个 ASPX 文件并将其设置为启动页，非常相似。为什么 Visual Studio 隐藏此设置没有意义，但这就是您的做法。