C# DbCommand的自定义可视化工具
您好,我正在尝试为应在Visual studio 2013中使用的DbCommand对象创建自定义可视化工具 我有以下代码C# DbCommand的自定义可视化工具,c#,visual-studio-2013,debuggervisualizer,C#,Visual Studio 2013,Debuggervisualizer,您好,我正在尝试为应在Visual studio 2013中使用的DbCommand对象创建自定义可视化工具 我有以下代码 using VisualizerTest; using Microsoft.VisualStudio.DebuggerVisualizers; using System; using System.Data.Common; using System.Diagnostics; using System.IO; using System.Runtime.Serializatio
using VisualizerTest;
using Microsoft.VisualStudio.DebuggerVisualizers;
using System;
using System.Data.Common;
using System.Diagnostics;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Windows.Forms;
[assembly: DebuggerVisualizer(typeof(TestVisualizer), typeof(CommandObjectSource), Target = typeof(DbCommand), Description = "Test")]
namespace VisualizerTest
{
public class TestVisualizer : DialogDebuggerVisualizer
{
protected override void Show(IDialogVisualizerService windowService, IVisualizerObjectProvider objectProvider)
{
DbCommand command;
try
{
using (Stream stream = objectProvider.GetData())
{
BinaryFormatter formatter = new BinaryFormatter();
command = (DbCommand)formatter.Deserialize(stream);
}
MessageBox.Show(command.CommandText);
}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}
}
namespace VisualizerTest
{
[Serializable]
public class CommandObjectSource : VisualizerObjectSource
{
public override void GetData(object target, Stream outgoingData)
{
if (target != null && target is DbCommand)
{
DbCommand command = (DbCommand)target;
BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(outgoingData, command);
}
}
}
}
但是,CommandObjectSource
从未被调用,相反,我得到了一个异常
Microsoft.VisualStudio.DebuggerVisualizers.DebugViewerShim.RemoteObjectSourceException: Type 'System.Data.SqlClient.SqlCommand' in Assembly 'System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable.
我的理解是,通过使用自定义源代码,我可以绕过序列化问题
作为旁注,我尝试将Target=typeof(DbCommand)
更改为Target=typeof(SqlCommand)
,但没有任何区别
测试代码:
class Program
{
static void Main(string[] args)
{
using (SqlCommand command = new SqlCommand("SELECT Field1 FROM table WHERE Field2 = @Value1"))
{
command.Parameters.AddWithValue("@Value1", 1338);
TestValue(command);
}
Console.ReadKey();
}
static void TestValue(object value)
{
VisualizerDevelopmentHost visualizerHost = new VisualizerDevelopmentHost(value, typeof(TestVisualizer));
visualizerHost.ShowVisualizer();
}
}
由于您显式创建的是
VisualizerDevelopmentHost
它不会使用DebuggerVisualizatorAttribute
,因此您必须将命令ObjectSource
作为第三个参数传入:
VisualizerDevelopmentHost visualizerHost =
new VisualizerDevelopmentHost(value, typeof(TestVisualizer),
typeof(CommandObjectSource));
通过此更改,将调用CommandObjectSource
,但仍然存在序列化问题,因为BinaryFormatter
还需要将类标记为Seralizabe
因此,您可能应该只包含CommandText
(或者创建一个新的DTO对象,并在需要多个属性时对其进行序列化),包括:
并用以下文字阅读:
public class TestVisualizer : DialogDebuggerVisualizer
{
protected override void Show(IDialogVisualizerService windowService, IVisualizerObjectProvider objectProvider)
{
string command;
try
{
command = new StreamReader(objectProvider.GetData()).ReadLine();
MessageBox.Show(command);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}
当我开始工作时,我会试试这个,如果它有效,我会很高兴:)
public class TestVisualizer : DialogDebuggerVisualizer
{
protected override void Show(IDialogVisualizerService windowService, IVisualizerObjectProvider objectProvider)
{
string command;
try
{
command = new StreamReader(objectProvider.GetData()).ReadLine();
MessageBox.Show(command);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}