C# 当前上下文中不存在名称“Console”

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class Program

class C

public int Value = 0;

static void Main(string[] args)

int v1=0;
int v2=v1;
v2 = 927;
C r1=new C();
C r2=r1 ;
r2.Value =112;
Console.WriteLine("Values:0,1",v1 ,v2 );
Console.WriteLine("Refs:0,1",r1 .Value ,r2 .Value);
Console.ReadLine();

初学C# 求大神

参考技术A 是不是没有引用using System;并且在方法或者类前加上public或者private...没有访问修饰符看着好别扭 参考技术B 看一眼项目,是不是控制台应用。 参考技术C 看看你的引用是不是丢了默认引用 参考技术D using System; 了没??

错误:名称在当前上下文中不存在(Webpart、C#、Visual Studios、SharePoint 2010)

【中文标题】错误:名称在当前上下文中不存在(Webpart、C#、Visual Studios、SharePoint 2010)【英文标题】:Error: The name does not exist in the current context (Webpart, C#, Visual Studios, SharePoint 2010) 【发布时间】:2013-09-28 11:34:33 【问题描述】:

我正在尝试向以前只读的页面添加控件。环境是:

SharePoint 2010 解决方案 在 Visual Studios 2010 中开发 此功能位于 Web 部件 (AceAllocation30.cs) 上 代码是C#

这是我添加的代码:

sb.Append("      <td width=\"75%\">"); lc3 = new LiteralControl(sb.ToString()); Controls.Add(lc3); TextBox JDHFTxt = new TextBox(); JDHFTxt.ID = "txtJDHF"; JDHFTxt.Enabled = true; JDHFTxt.Value = ConvertToAllocation(DrACE["SPRAmount"].ToString()); Controls.Add(JDHFTxt); sb = new StringBuilder();
sb.Append("</td>");

上面添加的代码替换了这段代码:

sb.Append("             <td class=\"rowText\" width=\"75%\">" + ConvertToAllocation(DrACE["SPRAmount"].ToString()) + "</td>");

要获得更完整的参考,以上内容的完整原始部分如下:

sb.Append("         <tr class=\"row2\">");
sb.Append("         <td class=\"rowTextLeft\" width=\"25%\">SPR/JDHF Allotment:</td>");
sb.Append("             <td class=\"rowText\" width=\"75%\">" + ConvertToAllocation(DrACE["SPRAmount"].ToString()) + "</td>");
sb.Append("         </tr>");

但是当我部署时出现以下错误:

错误 35; 'System.Web.UI.WebControls.TextBox' 不包含 'Value' 的定义并且没有扩展方法 'Value' 接受 'System.Web.UI.WebControls.TextBox' 类型的第一个参数可以是 找到(您是否缺少 using 指令或程序集引用?)

错误 32;当前上下文中不存在名称“lc3”

错误 33;当前上下文中不存在名称“lc3”

这是完整的页面代码:

using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
//Data Controls
using System.Runtime.InteropServices;
using System.Data;
using System.Collections.Specialized;
using System.Data.SqlClient;
using IDE_Utility.DBConnection;
using IDE_Utility.ErrorLogging;
using System.Text;


namespace GIK30.ACEAllocation30

    [ToolboxItemAttribute(false)]
    public class ACEAllocation30 : WebPart
    
        private bool _error = false;
        private string _myProperty = null;
        private Label m_lblMsg;
        private Button m_NewAllocation_Button;
        private HttpResponse Response = HttpContext.Current.Response;

        [Personalizable(PersonalizationScope.Shared)]
        [WebBrowsable(true)]
        [System.ComponentModel.Category("My Property Group")]
        [WebDisplayName("MyProperty")]
        [WebDescription("Meaningless Property")]
        public string MyProperty
        
            get
            
                if (_myProperty == null)
                
                    _myProperty = "";
                
                return _myProperty;
            
            set
                                                                                                                          
                _myProperty = value;
            
        

        public ACEAllocation30()
        
            this.ExportMode = WebPartExportMode.All;
        

        /// <summary>
        /// Create all your controls here for rendering.
        /// Try to avoid using the RenderWebPart() method.
        /// </summary>
        protected override void CreateChildControls()
        
            if (!_error)
            
                SPSite site = SPContext.Current.Site;
                DataSet DsAllocation = new DataSet();
                DataView DvAllocation = null;
                DataSet DsACE = new DataSet();
                DataRow DrACE;
                int ACEID = 0;

                if (site != null)
                
                    using (SPWeb web = site.OpenWeb())
                    
                        try
                        
                            int.TryParse(Page.Request["ACEID"], out ACEID);
                            int UserID = GIK20_CodeLibrary.GetUserID(SPContext.Current.Web);
                            StringCollection Access = GIK20_CodeLibrary.GetUserAccessForACE(UserID, ACEID);
                            bool IsACEAdmin = GIK20_CodeLibrary.IsUserACEAdmin(Access);
                            bool IsContracts = GIK20_CodeLibrary.IsUserAllocationSpecialist(Access);

                            // Make sure the ACE exists first
                            Boolean IsACE = false;
                            SqlParameter sqlParamACEID = new SqlParameter();
                            sqlParamACEID.ParameterName = "@aceid";
                            sqlParamACEID.DbType = DbType.Int32;
                            sqlParamACEID.Value = ACEID;

                            SqlParameter[] sqlParams = new SqlParameter[]
                            
                                sqlParamACEID
                            ;
                            try
                            
                                DsACE = DBConnection.GetDataSet("getAceInfo", CommandType.StoredProcedure, sqlParams);
                            
                            catch (Exception ex)
                            
                                HandleException(ex);
                                IDEErrLogging.LogError(new IDEException("ACE Allocation: Validate ACE: Error on Stored Procedure: getAceInfo", ex), true, false, SPContext.Current.Web);
                            
                            if (DsACE != null)
                            
                                if (DsACE.Tables[0].Rows.Count == 1)
                                    IsACE = true;
                            

                            if (IsACE)
                            
                                base.CreateChildControls();
                                DrACE = DsACE.Tables[0].Rows[0];

                                //strSQL = "select * from ACE_Allocation where ACEID = " + ACEID.ToString();
                                try
                                
                                    sqlParamACEID = new SqlParameter();
                                    sqlParamACEID.ParameterName = "@aceid";
                                    sqlParamACEID.DbType = DbType.Int32;
                                    sqlParamACEID.Value = ACEID;

                                    sqlParams = new SqlParameter[]
                                    
                                        sqlParamACEID
                                    ;
                                    DsAllocation = DBConnection.GetDataSet("getACeAllocation", CommandType.StoredProcedure, sqlParams);
                                    DvAllocation = DsAllocation.Tables[0].DefaultView;
                                    DvAllocation.Sort = "FY, AllocationType";
                                
                                catch (Exception ex)
                                
                                    HandleException(ex);
                                    IDEErrLogging.LogError(new IDEException("ACE Allocation: Error on ACE Allocation Stored Procedure: getACeAllocation", ex), true, false, SPContext.Current.Web);
                                

                                // Check to see if edit controls are enabled
                                Boolean enableStatus = false;
                                if (IsACEAdmin || IsContracts)
                                    enableStatus = true;

                                //enableStatus = GIK20_CodeLibrary.CheckUserInGroup(myWeb, statusArray);

                                string AllocationAvail = "No";
                                if (DrACE["AllocationAVailable"].Equals(true))
                                
                                    AllocationAvail = "Yes";
                                


                                StringBuilder sb = new StringBuilder();
                                sb.Append("<div class=\"border\" style=\"width:700px\">");
                                sb.Append("  <div class=\"partTitle\" >");
                                sb.Append("     <table cellspacing=\"0\" cellpadding=\"0\" height=\"25px\" width=\"100%\">");
                                sb.Append("         <tr>");
                                sb.Append("             <td class=\"partTitleText\">ACE ALLOCATION</td>");
                                sb.Append("         </tr>");
                                sb.Append("     </table>");
                                sb.Append("  </div>");
                                sb.Append("  <div class=\"columnHeader\">");
                                sb.Append("     <table cellspacing=\"0\" cellpadding=\"0\" height=\"25px\" width=\"100%\">");
                                sb.Append("         <tr>");
                                sb.Append("             <td class=\"columnHeaderText\" style=\"margin-top:5px;\">Allocation Information</td>");
                                sb.Append("         </tr>");
                                sb.Append("     </table>");
                                sb.Append("  </div>");
                                sb.Append("  <div class=\"rows\">");
                                sb.Append("     <table cellspacing=\"0\" cellpadding=\"0\" width=\"100%\">");
                                sb.Append("         <tr class=\"row1\">");
                                sb.Append("             <td class=\"rowTextLeft\" width=\"25%\">Allocation Available:</td>");
                                sb.Append("             <td class=\"rowText\" width=\"75%\">" + AllocationAvail + "</td>");
                                sb.Append("         </tr>");
                                sb.Append("         <tr class=\"row2\">");
                                sb.Append("             <td class=\"rowTextLeft\" width=\"25%\">SPR/JDHF Allotment:</td>");
                                sb.Append("             <td class=\"rowText\" width=\"75%\">" + ConvertToAllocation(DrACE["SPRAmount"].ToString()) + "</td>");
                                sb.Append("         </tr>");
                                sb.Append("         <tr class=\"row1\">");
                                sb.Append("             <td class=\"rowTextLeft\" width=\"25%\">SPR Source:</td>");
                                sb.Append("             <td class=\"rowText\" width=\"75%\">" + DrACE["SPRSource"] + "</td>");
                                sb.Append("         </tr>");
                                //sb.Append("         <tr class=\"row2\">");
                                //sb.Append("             <td class=\"rowTextLeft\" width=\"25%\">TEV:</td>");
                                //sb.Append("             <td class=\"rowText\" width=\"75%\">" + ConvertToAllocation(DrACE["EstVal"].ToString()) + "</td>");  //); + DrACE["SPRSource"] + "</td>");
                                //sb.Append("         </tr>");
                                sb.Append("         <tr class=\"row2\">");
                                sb.Append("             <td class=\"rowTextLeft\" width=\"25%\">Allocation Comments:</td>");
                                sb.Append("             <td class=\"rowText\" width=\"75%\">" + DrACE["AllocationComments"] + "</td>");
                                sb.Append("         </tr>");
                                sb.Append("     </table>");
                                sb.Append("  </div>");
                                sb.Append("  <div class=\"columnHeader\">");
                                sb.Append("     <table cellspacing=\"0\" cellpadding=\"0\" height=\"25px\" width=\"100%\">");
                                sb.Append("         <tr>");
                                sb.Append("             <td class=\"rowTextTitle\" width=\"21%\">Type</td>");
                                sb.Append("             <td class=\"rowTextTitle\" width=\"20%\">Source</td>");
                                sb.Append("             <td class=\"rowTextTitle\" width=\"20%\">FY</td>");
                                sb.Append("             <td class=\"rowTextTitle\" width=\"20%\">$ Amount</td>");
                                sb.Append("             <td width=\"19%\"></td>");
                                sb.Append("         </tr>");
                                sb.Append("     </table>");
                                sb.Append("  </div>");
                                sb.Append("  <div class=\"rows\">");
                                sb.Append("     <table cellspacing=\"0\" cellpadding=\"0\" width=\"100%\">");

                                if (DvAllocation != null)
                                
                                    Boolean row1 = true;
                                    int i = 1;
                                    LiteralControl lc2 = new LiteralControl();

                                    foreach (DataRowView DvAllocationRow in DvAllocation)
                                    
                                        if (row1)
                                        
                                            sb.Append("         <tr class=\"row1\">");
                                            row1 = false;
                                        
                                        else
                                        
                                            sb.Append("         <tr class=\"row2\">");
                                            row1 = true;
                                        


                                        sb.Append("             <td class=\"rowText\" width=\"21%\">" + DvAllocationRow["AllocationType"].ToString() + "</td>");
                                        sb.Append("             <td class=\"rowText\" width=\"20%\">" + DvAllocationRow["AllocationSourceName"].ToString() + "</td>");
                                        sb.Append("             <td class=\"rowText\" width=\"20%\">" + DvAllocationRow["FYTxt"].ToString() + "</td>");
                                        sb.Append("             <td class=\"rowText\" width=\"20%\">" + ConvertToAllocation(DvAllocationRow["Amount"].ToString()) + "</td>");
                                        string querystring = "?ACEID=" + DvAllocationRow["ACEID"].ToString() + "&ACEAllocationID=" + DvAllocationRow["ACE_AllocationID"].ToString();
                                        if (enableStatus)
                                        
                                            m_NewAllocation_Button = new Button();
                                            m_NewAllocation_Button.Text = "Edit Allocation";
                                            //m_NewAllocation_Button.Style = "font-size:8pt;font-family:Verdana,sans-serif";
                                            //m_NewAllocation_Button.Width = 80;
                                            //m_NewAllocation_Button.Height = 21;
                                            m_NewAllocation_Button.CssClass = "plainButton";
                                            m_NewAllocation_Button.ID = "NewAllocationButton" + i;
                                            m_NewAllocation_Button.Attributes.Add("OnClick", "window.open('../_layouts/GIK30/EditAllocation.aspx" + querystring + "');");
                                            //string[] statusArray = new string[]  "Owner", "SiteAdmin" ;
                                            m_NewAllocation_Button.Enabled = enableStatus;
                                            //m_NewAllocation_Button.Visible = enableStatus;

                                            sb.Append("             <td width=\"19%\" align=\"right\" style=\"padding-right:20px\">");
                                            lc2 = new LiteralControl(sb.ToString());
                                            Controls.Add(lc2);
                                            Controls.Add(m_NewAllocation_Button);
                                            sb = new StringBuilder();
                                            sb.Append("</td>");
                                        
                                        else
                                            sb.Append("             <td width=\"19%\"></td>");
                                        //sb.Append("             <td width=\"19%\"><input TYPE=\"button\" VALUE=\"Edit Allocation\" style=\"font-size:8pt;font-family:Verdana,sans-serif\" />");
                                        sb.Append("             </td>");
                                        sb.Append("         </tr>");
                                        i++;
                                    
                                
                                else
                                
                                    sb.Append("     <tr class=\"row1\"><td class=\"rowText\" width=\"100%\">Error Reading from Database</td></tr>");
                                
                                sb.Append("     </table>");
                                sb.Append("  </div>");
                                sb.Append("  <table cellspacing=\"0\" cellpadding=\"0\" style=\"margin-left:9px; margin-top:1px; margin-right:9px\">");
                                sb.Append("     <tr class=\"total\">");
                                sb.Append("         <td width=\"555px\" style=\"vertical-align:middle\">EV on Allotment: " + ConvertToAllocation(DrACE["EstVa"].ToString()) + "</td>");
                                sb.Append("         <td align=\"right\" style=\"padding-right:5px\">");
                                LiteralControl lc = new LiteralControl(sb.ToString());
                                Controls.Add(lc);

                                m_NewAllocation_Button = new Button();
                                m_NewAllocation_Button.Text = "Add New Allocation";
                                //m_NewAllocation_Button.Style = "font-size:8pt;font-family:Verdana,sans-serif";
                                //m_NewAllocation_Button.Width = 80;
                                //m_NewAllocation_Button.Height = 21;
                                m_NewAllocation_Button.CssClass = "plainButton";
                                m_NewAllocation_Button.ID = "NewAllocationButton";
                                m_NewAllocation_Button.Attributes.Add("OnClick", "window.open('../_layouts/GIK30/EditAllocation.aspx?ACEID=" + ACEID + "');");
                                //string[] statusArray = new string[]  "Owner", "SiteAdmin" ;
                                m_NewAllocation_Button.Enabled = enableStatus;
                                //m_NewAllocation_Button.Visible = enableStatus;
                                Controls.Add(m_NewAllocation_Button);

                                sb = new StringBuilder();
                                sb.Append("</td>");
                                sb.Append("     </tr>");
                                sb.Append("  </table>");
                                sb.Append("</div>");
                                lc = new LiteralControl(sb.ToString());
                                Controls.Add(lc);
                            
                        
                        catch (Exception ex)
                        
                            HandleException(ex);
                            IDEErrLogging.LogError(new IDEException("ACE Allocation: Error on ACE: " + ACEID.ToString(), ex), true, false, SPContext.Current.Web);
                        
                    
                
            
        

        /// <summary>
        /// Ensures that the CreateChildControls() is called before events.
        /// Use CreateChildControls() to create your controls.
        /// </summary>
        /// <param name="e"></param>
        protected override void OnLoad(EventArgs e)
        
            if (!_error)
            
                try
                
                    base.OnLoad(e);
                    this.EnsureChildControls();
                    // Your code here...
                
                catch (Exception ex)
                
                    HandleException(ex);
                
            
        

        /// <summary>
        /// Clear all child controls and add an error message for display.
        /// </summary>
        /// <param name="ex"></param>
        private void HandleException(Exception ex)
        
            this._error = true;
            this.Controls.Clear();
            this.Controls.Add(new LiteralControl(ex.Message));
        

        protected void m_NewAllocation_Button_Click(object sender, EventArgs e)
        
            Page.Response.Redirect("EditAllocation.aspx?ACEID=" + Page.Request["ACEID"]);
        

        private string ConvertToAllocation(string stramount)
        
            // Convert the real number to a $ format
            double amount = 0.0;
            if (!String.IsNullOrEmpty(stramount))
                amount = Convert.ToDouble(stramount);
            return string.Format("0:C", amount);
        
    

这是页面外观的模型:

【问题讨论】:

【参考方案1】:

问题是我在使用它之前没有添加我的文字控制。我在使用字段和控件构建表格之前添加了它:

LiteralControl lc3 = new LiteralControl();

【讨论】:

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