C#错误"...的类型初始化程序引发异常

Question

仅在某些计算机中出现此错误.通过读取堆栈信息,当我在静态类中调用此静态方法("FormatQuery")时会出现一些问题:

using System;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraEditors;
using FlexCel.Report;
using FlexCel.XlsAdapter;
using ComboBox=System.Windows.Forms.ComboBox;

namespace XSoftArt.A
{
    static class RHelper
    {
        private static string FormatQuery(string FieldName, int Count,
            CheckedListBox chekedListBox)
        {
            string ID = string.Empty;
            int n = Count;

            foreach (DataRowView item in chekedListBox.CheckedItems)
            {
                ID = ID + item["" + FieldName + ""];
                if (n > 1)
                {
                    ID = ID + " , ";
                    n--;
                }
            }
            return ID;
        }

        public static string FormatQuery(CheckedListBox chekedListBox)
        {
            return FormatQuery(chekedListBox.ValueMember,
                chekedListBox.CheckedItems.Count, chekedListBox);
        }
    }

所以有什么问题？我该如何解决？项目配置或重新布局模式有什么问题或者是什么？

错误信息:

   at XSoftArt.EVS.ReportHelper.FormatQuery(CheckedListBox chekedListBox)
   at XSoftArt.EVS.NewEmailSelectClient.LoadList_v2(String search, TextBox txtbox)
   at XSoftArt.EVS.NewEmailSelectClient.LoadContacts()
   at XSoftArt.EVS.NewEmailSelectClient.button7_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Answer 1

Type Initializer异常表示无法创建类型.当您只是引用该类时,通常会在调用方法之前发生这种情况.

这里的代码是您的类型的完整文本吗？我会寻找类似失败的任务.获得应用程序设置和这种性质的东西我看到了很多.

static class RHelper
{
     //If this line of code failed, you'd get this error
     static string mySetting = Settings.MySetting;
} 

您还可以使用类型的静态构造函数来查看此内容.

无论如何,这堂课还有吗？

Answer 2

我有同样的错误,但在我的情况下,它是由平台目标设置不匹配引起的.一个库专门设置为x86,而主应用程序设置为'Any'...然后我将我的开发移动到x64笔记本电脑.

Answer 3

当我修改Nlog配置文件并且没有正确格式化XML时,我收到此错误.

Answer 4

如果一个类尝试获取web.config.

例如，该类有一个静态变量 ClientID

private static string ClientID = System.Configuration.ConfigurationSettings.AppSettings["GoogleCalendarApplicationClientID"].ToString();

但web.config不包含“GoogleCalendarApplicationClientID”键，则任何静态函数调用或任何类实例创建都会引发错误

Answer 5

我尝试了你的代码：

CheckedListBox cb = new CheckedListBox();
for (var i = 1; i < 11; i++)
  cb.Items.Add("Item " + i, i % 3 == 0);

string fmt = RHelper.FormatQuery(cb);
Console.WriteLine(fmt);
Console.ReadLine();

它在这一行引发了异常：

foreach (DataRowView item in chekedListBox.CheckedItems)

// Unable to cast object of type 'System.String' to type 'System.Data.DataRowView'.

也许你也面临着同样的问题。不要转换为DataRowView，而是尝试进行以下更改：

foreach (var item in chekedListBox.CheckedItems)
{
    ID = ID + item.ToString(); // item["" + FieldName + ""];

因为 CheckedListBox 中的项目是对象类型。