小编Yel*_*ine的帖子

我不知道该怎么办,因为错误在于Form1.Designer.cs,因为我没有调试程序部分的经验.

//Form1
// 
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(352, 246);
this.Controls.Add(this.groupBox2);
this.Controls.Add(this.groupBox1);
this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.Name = "Form1";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "Generate Username";
this.groupBox1.ResumeLayout(false);
this.groupBox1.PerformLayout();
this.groupBox2.ResumeLayout(false);
this.groupBox2.PerformLayout();
this.ResumeLayout(false);

我是 SQL 和 C# 的新手，遇到了这个 SQL 错误。

参数化查询 '(@pid nvarchar(4000),@desc nvarchar(4000),@cat nvarchar(4000),@p' 需要参数 '@pid'，但未提供该参数。

我真的需要帮助。谢谢！

 public void InsertRecord()
    {
        SqlCommand cmd = new SqlCommand("INSERT INTO PRODUCTS VALUES (@pid, @desc, @cat, @price, @scode)", myCon);
        cmd.Parameters.AddWithValue("@pid", productID);
        cmd.Parameters.AddWithValue("@desc", description);
        cmd.Parameters.AddWithValue("@cat", category);
        cmd.Parameters.AddWithValue("@price", price);
        cmd.Parameters.AddWithValue("@scode", supplierCode);//corrected the "key codes"

        myCon.Open();
        cmd.ExecuteNonQuery();
        myCon.Close();//added these lines of codes
    }

我在 android studio 中导入了一个项目，我正在尝试编辑按钮的位置和 GUI 的一些内容，但我似乎无法在 .xml 文件中找到设计选项卡。有人可以帮帮我吗？谢谢

我似乎无法做到这一点.我正在android studio中复制一个关于SQLite数据库的youtube视频教程,我遇到了这个错误.有人可以帮忙吗？谢谢!

public class DataListActivity extends ActionBarActivity {
    ListView listView;
    SQLiteDatabase sqLiteDatabase;
    UserDBHelper userDBHelper;
    Cursor cursor;
    ListDataAdapter listDataAdapter;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.data_list_layout);

    listView = (ListView) findViewById(R.id.list_view);
    listDataAdapter = new ListDataAdapter(getApplication(), R.layout.row_layout);
    listView.setAdapter(listDataAdapter);
   userDBHelper = new UserDBHelper(getApplicationContext());
    sqLiteDatabase = new userDBHelper.getReadableDatabase();
    cursor = userDBHelper.getInformations(sqLiteDatabase);
    if (cursor.moveToFirst()) {
        do {

            String Fname, Lname, Email, Password, Contact, Address;
            Fname = cursor.getString(0);
            Lname = cursor.getString(1);
            Email = cursor.getString(2);
            Password = cursor.getString(3);
            Contact = cursor.getString(4);
            Address = cursor.getString(5);
            DataProvider dataProvider = …