“使用/ main编译以指定包含入口点的类型。”

根据下面的代码，我收到以下消息。 我相当肯定“为什么”我得到它，我只是不知道如何重新安排代码来移动/删除/替换其中一个错误导致语句。

“使用/ main编译以指定包含入口点的类型。”

在“static void Main（string [] args）”下面有一堆代码，我从http://support.microsoft.com/kb/816112得到的目的是为了从自动增量获取ID，所以当其余代码填充Access数据库时，我可以自动增加它。 任何帮助表示赞赏。 我们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

没有一个答案直截了当。

通过右键单击项目访问的项目属性Dialog具有“应用程序”选项卡。 在此选项卡上有一个“启动对象”的下拉列表 – 只需选择Visual Studio应该定位的正确类文件。 只要该类文件中存在Main静态void事件，它就会以它为目标。 确保Main是大写的。 这不起作用：

static void main（string [] args）{… code …}

这是一张图片：

在Web项目中，您可以右键单击ASPX文件并将其设置为启动页面，非常相似。 为什么Visual Studio掩盖此设置没有意义，但这就是你如何做到这一点。

Answer 2

如果使用Visual Studio编译/调试应用程序，则应在项目属性中设置程序的入口点。
第一页 – >申请
启动对象 – > YourNameSpace.WindowsApplication1.Form1

没有必要为此重新安排代码。 但是，查看提供的代码，我无法看到您启动Form1的任何一点。 Main方法内部缺少启动Form1的代码。 就像是

 Application.Run(new Form1()); 

Answer 3

编译器抱怨它无法找到实现应用程序入口点的类型（即Main方法），可能是因为在程序集中有多个具有兼容 Main方法的类型。

解决此问题的一种方法是使用/main选项，如/main:Form1 。 当然，如果问题是存在多个Main方法，那么更好的解决方案是简单地删除您不打算使用的方法。