将列表框项目作为列名添加到 SQL 服务器列

Question

foreach (string LB in listBox1.Items)
{
    SqlCommand SCA = new SqlCommand("create table " + textBox3.Text + "("+ 
    listBox1.Items[].ToString()+")",SC1); 
    SCA.ExecuteNonQuery();
}

如何使用循环添加所有项目以将 listbox.items 上的项目添加到 SQL 仅用于列名称的服务器列？

示例：

Answer 1

您正在尝试循环创建多个同名表。我想你的代码应该是这样的：

// StringBuilder is better way to creating a string in a loop,
// because it doesn't allocate new string on each concatenation
StringBuilder command = new StringBuilder("create table ");
command.Append(textBox3.Text).Append("(");

string separator = "";

// It is better to give more descriptive names to variables
foreach (string columnName in listBox1.Items)
{
    // You forgot to specify column type
    command.Append(separator)
           .Append(columnName)
           .Append(" varchar(1000)");

    separator = ",";
}

command.Append(")");

// SqlCommand and SqlConnection implement IDisposable, 
// so it is better to wrap their instantiation by 'using' statement 
// in order to free corresponding resources
using (SqlCommand sqlCommand = new SqlCommand(command.ToString(), SC1)) {
    sqlCommand.ExecuteNonQuery();
}

将列表框项目作为列名添加到 SQL 服务器列

Add listbox item to SQL Server columns as columns name

c#

sql-server

listbox

winforms