C# 看不懂,public void frmBooksql(){//打开数据库SqlConnection mySqlConnection = new SqlConnection(Conn);mySqlConnection.Open();string sqlQuery = "SELECT * FROM Book";SqlCommand mySqlCommand = new SqlCommand(sqlQuery,mySqlConnection);mySqlComma
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c# base的意义public abstract class B { public B(D t) { Console.WriteLine(B); } public void K() { Console.WriteLine(K); } } public class C : B { public C(String
C# 看不懂,public void frmBooksql(){//打开数据库SqlConnection mySqlConnection = new SqlConnection(Conn);mySqlConnection.Open();string sqlQuery = SELECT * FROM Book;SqlCommand mySqlCommand = new SqlCommand(sqlQuery,mySqlConnection);mySqlComma
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