相关疑难解决方法(0)

如何查看实体框架生成的SQL？

(在我的特殊情况下,我正在使用mysql提供程序 - 如果它很重要)

我试图通过覆盖SaveChanges()方法使用EF 4.1实现AuditLog,如下所述:

• http://jmdority.wordpress.com/2011/07/20/using-entity-framework-4-1-dbcontext-change-tracking-for-audit-logging/
• 实体框架4.1 DbContext覆盖SaveChanges以审核属性更改

我遇到了"修改"条目的问题.每当我尝试获取相关属性的OriginalValue时,它总是具有与CurrentValue字段中相同的值.

我首先使用此代码,并成功识别修改的条目:

public int SaveChanges(string userID)
{

    // Have tried both with and without the following line, and received same results:
    // ChangeTracker.DetectChanges();

    foreach (
      var ent in this.ChangeTracker
                     .Entries()
                     .Where(p => p.State == System.Data.EntityState.Added
                                     p.State == System.Data.EntityState.Deleted             
                                     p.State == System.Data.EntityState.Modified))
    {
        // For each change record, get the audit record entries and add them
        foreach (AuditLog log in GetAuditRecordsForChange(ent, userID))
        {
            this.AuditLog.Add(log);
        }

    }

    return base.SaveChanges();
}

问题在于此(缩写代码):

    private List<AuditLog> …