自定义控件(ascx) LoadViewState错误:无法将“System.Object[]”类型的对象强制转换为“System.Web.UI.Pair”类型
自定义控件(ascx) LoadViewState错误:无法将“System.Object[]”类型的对象强制转换为“System.Web.UI.Pair”类型
提问于 2016-03-12 02:02:16
我正在尝试将下面的代码片段从一个ASP.NET网站迁移到一个。
我得到了以下错误：Unable to cast object of type 'System.Object[]' to type 'System.Web.UI.Pair'。
在这一行(在LoadViewState方法中)生成错误：base.LoadViewState(VS_all[0]);
我不明白为什么，因为方法接受对象，那么为什么它关心呢？
public partial class Skins_DownloadGridView : System.Web.UI.UserControl
{
private const string CtlIdent = "Controls_DownloadGridView";
private string _Cat = "NONE";
private string _SubCat = "";
private string _SubCatHeader;
private string _FileNameHeader;
private string _FileDescHeader;
private string _ActionsHeader;
private bool _debug = false;
private bool _enabled = false;
private EOL.UI.Web.GVUtility GVUtil = new EOL.UI.Web.GVUtility();
protected override object SaveViewState()
{
EOL.Common.Logging.LogDebug(string.Format("{0}.SaveViewState", CtlIdent), EOL.Common.Constants.DebugCodes.UserControls);
object VS_base = base.SaveViewState();
object[] VS_all = new object[9];
VS_all[0] = VS_base;
VS_all[1] = _Cat;
VS_all[2] = _SubCat;
VS_all[3] = _SubCatHeader;
VS_all[4] = _FileNameHeader;
VS_all[5] = _FileDescHeader;
VS_all[6] = _ActionsHeader;
VS_all[7] = _debug;
VS_all[8] = _enabled;
return VS_all;
}
protected override void LoadViewState(object VS_saved)
{
EOL.Common.Logging.LogDebug(string.Format("{0}.LoadViewState", CtlIdent), EOL.Common.Constants.DebugCodes.UserControls);
if ((VS_saved != null))
{
object[] VS_all = new object[]{VS_saved};
if ((VS_all[0] != null))
***base.LoadViewState(VS_all[0]);*** <--- Error generated here.
if ((VS_all[1] != null))
_Cat = Convert.ToString(VS_all[1]);
if ((VS_all[2] != null))
_SubCat = Convert.ToString(VS_all[2]);
if ((VS_all[3] != null))
_SubCatHeader = Convert.ToString(VS_all[3]);
if ((VS_all[4] != null))
_FileNameHeader = Convert.ToString(VS_all[4]);
if ((VS_all[5] != null))
_FileDescHeader = Convert.ToString(VS_all[5]);
if ((VS_all[6] != null))
_ActionsHeader = Convert.ToString(VS_all[6]);
if ((VS_all[7] != null))
_debug = Convert.ToBoolean(VS_all[7]);
if ((VS_all[8] != null))
Enabled = Convert.ToBoolean(VS_all[8]);
}
}
}回答 2
Stack Overflow用户
回答已采纳
发布于 2016-03-12 03:18:39
如果使用Reflector或JustDecompile，即使它接受对象类型，也会在内部看到LoadViewState需要对。因此，如果您重构您的保存返回：
return new Pair(VS_base, VS_all);并将LoadViewState更改为：
瓦尔帕尔
ir = (Pair)savedState;
base.LoadViewState(pair.First);
var VS_all = (object[])pair.Second;
//Load它应该解决这个问题。取自原始源(使用JustDecompile)：
LoadViewState：
if (savedState != null) {
Pair pair = (Pair)savedState;Stack Overflow用户
发布于 2016-03-18 22:00:11
感谢布莱恩·马恩斯的解决方案。下面是包含他的建议的代码，以防有人需要类似的帮助。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
public partial class Skins_DownloadGridView : System.Web.UI.UserControl
{
private const string CtlIdent = "Controls_DownloadGridView";
private string _Cat = "NONE";
private string _SubCat = "";
private string _SubCatHeader;
private string _FileNameHeader;
private string _FileDescHeader;
private string _ActionsHeader;
private bool _debug = false;
private bool _enabled = false;
private UCLA.EOL.UI.Web.GVUtility GVUtil = new UCLA.EOL.UI.Web.GVUtility();
protected override object SaveViewState()
{
UCLA.EOL.Common.Logging.LogDebug(string.Format("{0}.SaveViewState", CtlIdent), UCLA.EOL.Common.Constants.DebugCodes.UserControls);
object VS_base = base.SaveViewState();
object[] VS_all = new object[9];
VS_all[0] = VS_base;
VS_all[1] = _Cat;
VS_all[2] = _SubCat;
VS_all[3] = _SubCatHeader;
VS_all[4] = _FileNameHeader;
VS_all[5] = _FileDescHeader;
VS_all[6] = _ActionsHeader;
VS_all[7] = _debug;
VS_all[8] = _enabled;
//return VS_all;
return new Pair(VS_base, VS_all); // <-- Change
}
protected override void LoadViewState(object VS_saved)
{
UCLA.EOL.Common.Logging.LogDebug(string.Format("{0}.LoadViewState", CtlIdent), UCLA.EOL.Common.Constants.DebugCodes.UserControls);
if ((VS_saved != null))
{
object[] VS_all = new object[]{VS_saved};
// *** CHANGE START ***
Pair pair = (Pair)VS_saved;
if ((VS_all[0] != null))
base.LoadViewState(pair.First);
VS_all = (Object[])pair.Second;
// *** CHANGE END ***
if ((VS_all[1] != null))
_Cat = Convert.ToString(VS_all[1]);
if ((VS_all[2] != null))
_SubCat = Convert.ToString(VS_all[2]);
if ((VS_all[3] != null))
_SubCatHeader = Convert.ToString(VS_all[3]);
if ((VS_all[4] != null))
_FileNameHeader = Convert.ToString(VS_all[4]);
if ((VS_all[5] != null))
_FileDescHeader = Convert.ToString(VS_all[5]);
if ((VS_all[6] != null))
_ActionsHeader = Convert.ToString(VS_all[6]);
if ((VS_all[7] != null))
_debug = Convert.ToBoolean(VS_all[7]);
if ((VS_all[8] != null))
Enabled = Convert.ToBoolean(VS_all[8]);
}
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/35952873
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