C# 如何在整个应用程序中使用变量？

如何将返回的

memberID

变量插入到另一个SQL存储过程中

  protected void imgBtnActivate_onClick(object sender, EventArgs e)
{

    // Inserts Member record
    try
    {
        Database db = DatabaseFactory.CreateDatabase(ConfigManager.AppSettings["ConnectionString.Dev"]);

        DbCommand dbCommand = db.GetStoredProcCommand("dbo.ins_member_p");
        db.AddInParameter(dbCommand, "@FirstName", DbType.String, txtFirstName.Text);
        db.AddInParameter(dbCommand, "@LastName", DbType.String, txtLastName.Text);
        db.ExecuteNonQuery(dbCommand);
        int memberID = Convert.ToInt32(db.GetParameterValue(dbCommand, "MemberNewID").ToString());

}
    catch (Exception ex)
    {
        ExceptionPolicy.HandleException(ex, "Notify Policy");
    }


    // Insert Member Email
    try
        {

Database db = DatabaseFactory.CreateDatabase(ConfigManager.AppSettings["ConnectionString.Dev"]);

            DbCommand dbCommand = db.GetStoredProcCommand("[ins_MemberEmail_p]");
            dbCommand.Transaction = dbTran;

            db.AddInParameter(dbCommand, "MemberID", DbType.Int32, memberID);
            db.AddInParameter(dbCommand, "SourceID", DBType.In32, 33);
            db.AddInParameter(dbCommand, "EmailAddress", DbType.String, EncryptedEmailAddress);

    }
    catch (Exception ex)
    {
        ExceptionPolicy.HandleException(ex, "Notify Policy");
    }
}

---

像这样更改它，将变量的声明移出{}，在它之前

protected void imgBtnActivate_onClick(object sender, EventArgs e)
{

int memberID;

// Inserts Member record
try
{
    Database db = DatabaseFactory.CreateDatabase(ConfigManager.AppSettings["ConnectionString.Dev"]);

    DbCommand dbCommand = db.GetStoredProcCommand("dbo.ins_member_p");
    db.AddInParameter(dbCommand, "@FirstName", DbType.String, txtFirstName.Text);
    db.AddInParameter(dbCommand, "@LastName", DbType.String, txtLastName.Text);
    db.ExecuteNonQuery(dbCommand);
    memberID = Convert.ToInt32(db.GetParameterValue(dbCommand, "MemberNewID").ToString());

}
catch (Exception ex)
{
    ExceptionPolicy.HandleException(ex, "Notify Policy");
}

---

像这样更改它，将变量的声明移出{}，在它之前

protected void imgBtnActivate_onClick(object sender, EventArgs e)
{

int memberID;

// Inserts Member record
try
{
    Database db = DatabaseFactory.CreateDatabase(ConfigManager.AppSettings["ConnectionString.Dev"]);

    DbCommand dbCommand = db.GetStoredProcCommand("dbo.ins_member_p");
    db.AddInParameter(dbCommand, "@FirstName", DbType.String, txtFirstName.Text);
    db.AddInParameter(dbCommand, "@LastName", DbType.String, txtLastName.Text);
    db.ExecuteNonQuery(dbCommand);
    memberID = Convert.ToInt32(db.GetParameterValue(dbCommand, "MemberNewID").ToString());

}
catch (Exception ex)
{
    ExceptionPolicy.HandleException(ex, "Notify Policy");
}

---

只需在第一个

try…catch

块外定义

int memberID

，以便在第二个

try…catch

块内可见：

protected void imgBtnActivate_onClick(object sender, EventArgs e)
{
    // define it here
    int memberID = -1:

    // Inserts Member record
    try
    {
        ......
        db.ExecuteNonQuery(dbCommand);
        memberID = Convert.ToInt32(db.GetParameterValue(dbCommand, "MemberNewID").ToString());
    }
    catch (Exception ex)
    {
        ExceptionPolicy.HandleException(ex, "Notify Policy");
    }

    // Insert Member Email
    try
    {
        ......
        // then it'll be visible and useable here!
        db.AddInParameter(dbCommand, "MemberID", DbType.Int32, memberID);
        .....
    }
    catch (Exception ex)
    {
        ExceptionPolicy.HandleException(ex, "Notify Policy");
    }
}

---

只需在第一个

try…catch

块外定义

int memberID

，以便在第二个

try…catch

块内可见：

protected void imgBtnActivate_onClick(object sender, EventArgs e)
{
    // define it here
    int memberID = -1:

    // Inserts Member record
    try
    {
        ......
        db.ExecuteNonQuery(dbCommand);
        memberID = Convert.ToInt32(db.GetParameterValue(dbCommand, "MemberNewID").ToString());
    }
    catch (Exception ex)
    {
        ExceptionPolicy.HandleException(ex, "Notify Policy");
    }

    // Insert Member Email
    try
    {
        ......
        // then it'll be visible and useable here!
        db.AddInParameter(dbCommand, "MemberID", DbType.Int32, memberID);
        .....
    }
    catch (Exception ex)
    {
        ExceptionPolicy.HandleException(ex, "Notify Policy");
    }
}

---

首先，我建议您稍微拆分一下代码。您正在控制事件处理程序中执行大量逻辑（包括数据访问，可能还有一些域逻辑）

但问题的直接解决办法是在

try/catch

块之外删除

memberID

 protected void imgBtnActivate_onClick(object sender, EventArgs e) 
{ 
    int memberID;
    // Inserts Member record 
    try 
    { 
        Database db = DatabaseFactory.CreateDatabase(ConfigManager.AppSettings["ConnectionString.Dev"]); 

        DbCommand dbCommand = db.GetStoredProcCommand("dbo.ins_member_p"); 
        db.AddInParameter(dbCommand, "@FirstName", DbType.String, txtFirstName.Text); 
        db.AddInParameter(dbCommand, "@LastName", DbType.String, txtLastName.Text); 
        db.ExecuteNonQuery(dbCommand); 
        memberID = Convert.ToInt32(db.GetParameterValue(dbCommand, "MemberNewID").ToString()); 

    } 
// .... so on and so forth

---

按照上面的方法，您将在整个事件处理程序的作用域内拥有

memberID

，这反过来将允许您在整个处理程序的作用域中使用该变量。

首先，我建议您稍微拆分代码。您正在控制事件处理程序中执行大量逻辑（包括数据访问，可能还有一些域逻辑）

但问题的直接解决办法是在

try/catch

块之外删除

memberID

 protected void imgBtnActivate_onClick(object sender, EventArgs e) 
{ 
    int memberID;
    // Inserts Member record 
    try 
    { 
        Database db = DatabaseFactory.CreateDatabase(ConfigManager.AppSettings["ConnectionString.Dev"]); 

        DbCommand dbCommand = db.GetStoredProcCommand("dbo.ins_member_p"); 
        db.AddInParameter(dbCommand, "@FirstName", DbType.String, txtFirstName.Text); 
        db.AddInParameter(dbCommand, "@LastName", DbType.String, txtLastName.Text); 
        db.ExecuteNonQuery(dbCommand); 
        memberID = Convert.ToInt32(db.GetParameterValue(dbCommand, "MemberNewID").ToString()); 

    } 
// .... so on and so forth

上述方法将在整个事件处理程序的作用域内使用

memberID

，从而允许在整个处理程序的作用域内使用该变量