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C#

SheetAttachment.cs：源码内容
							﻿using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.Collections.Generic;
[assembly: TagPrefix("OThinker.H3.WorkSheet", "SheetControls")]
namespace OThinker.H3.WorkSheet
{
    /// <summary>
    /// 用于管理多附件，格式应该是
    /// 添加附件（可写的时候可见） 读取附件1的链接 删除附件1的链接（可写的时候可见） 读取附件2的链接 删除附件2的链接 （可写的时候可见）
    /// </summary>
    [DefaultProperty("Text"),
    ToolboxData("<{0}:SheetAttachment runat=server></{0}:SheetAttachment>")]
    public class SheetAttachment : System.Web.UI.WebControls.WebControl, ISheetControl
    {
        public SheetAttachment()
        {
            this.ListBox = new ListBox();
            this.Controls.Add(this.ListBox);
            this.HiddenField = new HiddenField();
            this.Controls.Add(this.HiddenField);
            this.FileUpload = new FileUpload();
            this.Controls.Add(this.FileUpload);
            this.RemovedFiles = new TextBox();
            this.RemovedFiles.Attributes.Add("style", "display: none;");
            this.Controls.Add(this.RemovedFiles);
        }
        private ListBox ListBox;
        private HiddenField HiddenField;
        private FileUpload FileUpload;
        private TextBox RemovedFiles;
        private bool _Enabled = true;
        public override bool Enabled
        {
            get
            {
                return this._Enabled;
            }
            set
            {
                this._Enabled = value;
            }
        }
        #region DataField属性
        private string _DataField;
        [Bindable(true), Category("WorkSheet"), DefaultValue("")]
        [Editor(typeof(DataSelector), typeof(UITypeEditor))]
        public string DataField
        {
            get
            {
                return this._DataField;
            }
            set
            {
                this._DataField = value;
            }
        }
        #endregion
        #region ISheetControl 接口
        /// <summary>
        /// 加载数据
        /// </summary>
        /// <param name="SheetPage"></param>
        public virtual void LoadDataField(OThinker.H3.WorkSheet.SheetPage SheetPage)
        {
            if (this.DataField == null || this.DataField == "")
            {
                // 数据字段为空
            }
            else if (SheetPage.Enviroment.InstanceData[this.DataField] == null)
            {
                // 检查是否存在
            }
            else if (!OThinker.H3.Data.DataLogicTypeConvertor.IsAttachmentType(SheetPage.Enviroment.InstanceData[this.DataField].LogicType))
            {
                // 类型不匹配
            }
            else if (SheetPage.Enviroment.InstanceData[this.DataField].Visible == false)
            {
                // 不能见
                this.Visible = false;
            }
            else
            {
                // 如果能够修改则允许上传
                this.Enabled = SheetPage.Enviroment.InstanceData[this.DataField].Editable;
            }
        }
        /// <summary>
        /// 验证数据
        /// </summary>
        /// <param name="SheetPage"></param>
        /// <param name="Errors"></param>
        /// <returns></returns>
        public virtual bool ValidateDataField(
            OThinker.H3.WorkSheet.SheetPage SheetPage,
            System.Collections.Generic.List<string> Errors)
        {
            return true;
        }
        /// <summary>
        /// 保存数据
        /// </summary>
        /// <param name="SheetPage"></param>
        public virtual void SaveDataField(OThinker.H3.WorkSheet.SheetPage SheetPage)
        {
            // 将要删除的文件删除
            string removedFileText = this.RemovedFiles.Text;
            string[] removedFiles = null;
            if (removedFileText != null)
            {
                removedFiles = removedFileText.Split(';');
            }
            if (removedFiles != null)
            {
                foreach (string id in removedFiles)
                {
                    if (id != null && id != "")
                    {
                        OThinker.H3.Server.Engine.InstanceDataManager.RemoveAttachment(id);
                    }
                }
            }
            // 添加新添加的文件
            foreach (string key in SheetPage.Request.Files.AllKeys)
            {
                if (key == null || key == "")
                {
                    continue;
                }
                if (key.IndexOf(this.ClientID) != 0)
                {
                    continue;
                }
                System.Web.HttpPostedFile file = SheetPage.Request.Files[key];
                if (file == null || file.FileName == null || file.FileName == "")
                {
                    continue;
                }
                // 添加这个附件
                OThinker.H3.Data.Attachment attachment = new OThinker.H3.Data.Attachment();
                attachment.Activity = SheetPage.Enviroment.ActivityName;
                byte[] content = new byte[file.InputStream.Length];
                file.InputStream.Read(content, 0, content.Length);
                attachment.Content = content;
                attachment.ContentType = file.ContentType;
                attachment.CreatedBy = SheetPage.Enviroment.Participant;
                attachment.CreatedTime = System.DateTime.Now;
                attachment.DataField = this.DataField;
                attachment.Description = null;
                attachment.TokenId = SheetPage.Enviroment.WorkItem.TokenId;
                attachment.FileName = file.FileName.Substring(file.FileName.LastIndexOf('\') + 1);
                attachment.InstanceId = SheetPage.Enviroment.InstanceId;
                attachment.LastVersion = true;
                attachment.ModifiedBy = null;
                attachment.ModifyTime = System.DateTime.Now;
                OThinker.H3.Server.Engine.InstanceDataManager.AddAttachment(attachment);
            }
        }
        #endregion
        protected override void Render(HtmlTextWriter output)
        {
            // 显示读取的模块
            if (this.DesignMode)
            {
                for (int count = 0; count < 3; count++)
                {
                    HyperLink lnkAttachment = new HyperLink();
                    lnkAttachment.NavigateUrl = "";
                    lnkAttachment.Target = "_blank";
                    lnkAttachment.Text = "文件" + count;
                    lnkAttachment.RenderControl(output);
                    HyperLink lnkRemove = new HyperLink();
                    lnkRemove.Text = "删除";
                    lnkAttachment.NavigateUrl = "";
                    lnkRemove.RenderControl(output);
                    Label separator = new Label();
                    separator.Text = "  ";
                    separator.RenderControl(output);
                }
            }
            else
            {
                // 查询
                OThinker.H3.Data.AttachmentHeader[] headers = null;
                if (((SheetPage)this.Page).Enviroment.InstanceId == Instance.InstanceContext.UnspecifiedID)
                {
                    // 流程的创建状态
                    headers = null;
                }
                else
                {
                    // 读取已经上传的文件
                    headers = OThinker.H3.Server.Engine.InstanceDataManager.QueryAttachment(((SheetPage)this.Page).Enviroment.InstanceId, this.DataField, OThinker.Data.BoolMatchValue.True, null);
                }
                if (headers == null || headers.Length == 0)
                {
                    output.Write("没有附件");
                }
                else
                {
                    foreach (OThinker.H3.Data.AttachmentHeader header in headers)
                    {
                        if (header == null)
                        {
                            continue;
                        }
                        HyperLink lnkAttachment = new HyperLink();
                        this.Controls.Add(lnkAttachment);
                        lnkAttachment.NavigateUrl = ((SheetPage)this.Page).Enviroment.GetReadAttachment(header.AttachmentID);
                        lnkAttachment.Target = "_blank";
                        lnkAttachment.Text = header.FileName;
                        // 如果没有这句话，则不会产生ID
                        lnkAttachment.Attributes.Add(
                            "onclick",
                            "javascript:" +
                            "document.getElementById('" + this.RemovedFiles.ClientID + "');" +
                            "document.getElementById('" + lnkAttachment.ClientID + "');");
                        lnkAttachment.RenderControl(output);
                        HyperLink lnkRemove = new HyperLink();
                        this.Controls.Add(lnkRemove);
                        lnkRemove.ImageUrl = ((SheetPage)this.Page).Enviroment.GetDeleteAttachmentImageUrl();
                        lnkRemove.Attributes.Add("style", "cursor: hand");
                        lnkRemove.Attributes.Add(
                            "onclick",
                            "javascript:" +
                            "document.getElementById('" + this.RemovedFiles.ClientID + "').value += ('" + header.AttachmentID + ";');" +
                            "document.getElementById('" + lnkAttachment.ClientID + "').style.display = 'none';" +
                            "document.getElementById('" + lnkRemove.ClientID + "').style.display = 'none';");
                        if (this.Enabled)
                        {
                            lnkRemove.RenderControl(output);
                        }
                        Label separator = new Label();
                        separator.Text = "  ";
                        separator.RenderControl(output);
                    }
                }
            }
            // 记录删除的附件的控件
            if (!this.DesignMode)
            {
                this.RemovedFiles.RenderControl(output);
            }
            // 显示添加附件模块
            if (this.Enabled)
            {
                this.ListBox.Attributes.Add("style", "width:80%;");
            
                string divId = this.ClientID + "_DivAppend";
                string hideButton = this.ClientID + "_HideButton";
                string displayButton = this.ClientID + "_DisplayButton";
                // 隐藏显示按钮
                output.Write("<input type="button" name="" + hideButton + "" value="-" style="display: none;" onClick="javascript:" + divId + ".style.display='none';" + hideButton + ".style.display='none';" + displayButton + ".style.display='block';">");
                output.Write("<input type="button" name="" + displayButton + "" value="+" onClick="javascript:" + divId + ".style.display='block';" + hideButton + ".style.display='block';" + displayButton + ".style.display='none';">");
                output.Write("<div id="" + divId + "" style="display: none;">");
                string addinput = this.ClientID + "_addinput";
                string fileNum = this.ClientID + "_fileNum";
                string remove = this.ClientID + "_remove";
                string file = this.ClientID + "_file";
                string files = this.ClientID + "_files";
                if (!this.Page.ClientScript.IsClientScriptBlockRegistered("SheetMultiAttachmentScript"))
                {
                    output.Write("<script type="text/javascript">" + "rn");
                    output.Write("var " + fileNum + " = 0;" + "rn");
                    // 添加
                    output.Write("function " + addinput + "()" + "rn");
                    output.Write("{" + "rn");
                    output.Write("//隐藏File控件" + "rn");
                    output.Write("var ofile = document.getElementById("" + file + "" + " + fileNum + ");" + "rn");
                    output.Write("if(ofile.value=='')" + "rn");
                    output.Write("{" + "rn");
                    output.Write("return;" + "rn");
                    output.Write("}" + "rn");
                    output.Write("// 检查是否重复" + "rn");
                    output.Write("var myOptions=document.getElementById("" + this.ListBox.ClientID + "").options;" + "rn");
                    output.Write("for (i=0; i<myOptions.length; i++)" + "rn");
                    output.Write("{" + "rn");
                    output.Write("if (myOptions[i].text == ofile.value)" + "rn");
                    output.Write("{" + "rn");
                    output.Write("alert("该文件已存在列表当中，请不要重复选择！");" + "rn");
                    output.Write("return;" + "rn");
                    output.Write("}" + "rn");
                    output.Write("}" + "rn");
                    output.Write("ofile.style.display = 'none';" + "rn");
                    output.Write("//创建新file控件" + "rn");
                    output.Write("var f = document.createElement("input");" + "rn");
                    output.Write("" + fileNum + " = " + fileNum + " + 1;" + "rn");
                    output.Write("f.type = 'file';" + "rn");
                    output.Write("f.name = '" + file + "'+" + fileNum + ";" + "rn");
                    output.Write("f.id = '" + file + "'+" + fileNum + ";" + "rn");
                    output.Write("f.size = '20';" + "rn");
                    output.Write("f.className = 'in3';" + "rn");
                    output.Write("var div1 = document.getElementById("" + files + "")" + "rn");
                    output.Write("div1.insertAdjacentElement("BeforeBegin", f);" + "rn");
                    output.Write("// 添加到列表中" + "rn");
                    output.Write("var mySelect = document.getElementById("" + this.ListBox.ClientID + "");" + "rn");
                    output.Write("var option = new Option(ofile.value, ofile.name);" + "rn");
                    output.Write("mySelect.options.add(option);" + "rn");
                    output.Write("mySelect.options.selectedIndex = mySelect.options.length-1;" + "rn");
                    // output.Write("mySelect.size++;" + "rn");
                    output.Write("}" + "rn");
                    output.Write("function " + remove + "()" + "rn");
                    output.Write("{" + "rn");
                    output.Write("var mySelect=document.getElementById("" + this.ListBox.ClientID + "");" + "rn");
                    output.Write("var selectedIndex=mySelect.selectedIndex;" + "rn");
                    output.Write("if (selectedIndex == -1)" + "rn");
                    output.Write("{" + "rn");
                    output.Write("alert("请选择要移除的文件!");" + "rn");
                    output.Write("return;" + "rn");
                    output.Write("}" + "rn");
                    output.Write("var inputID = mySelect.options[selectedIndex].value;" + "rn");
                    output.Write("mySelect.options.remove(selectedIndex);" + "rn");
                    output.Write("if(selectedIndex == 0)" + "rn");
                    output.Write("{" + "rn");
                    output.Write("mySelect.options.selectedIndex=0;" + "rn");
                    output.Write("}" + "rn");
                    output.Write("else" + "rn");
                    output.Write("{" + "rn");
                    output.Write("mySelect.options.selectedIndex=selectedIndex-1;" + "rn");
                    output.Write("}" + "rn");
                    // output.Write("mySelect.size--;" + "rn");
                    output.Write("//非电子文件，移出input按钮" + "rn");
                    output.Write("if (inputID.lastIndexOf("\\")==-1)" + "rn");
                    output.Write("{" + "rn");
                    output.Write("var objinput = document.getElementById(inputID);" + "rn");
                    output.Write("objinput.removeNode(true);" + "rn");
                    output.Write("}" + "rn");
                    output.Write("else" + "rn");
                    output.Write("{" + "rn");
                    output.Write("//删除隐藏域的一个值" + "rn");
                    output.Write("var obj= document.getElementById("" + this.HiddenField.ClientID + "");" + "rn");
                    output.Write("var str=obj.value;" + "rn");
                    output.Write("var Files =new Array();" + "rn");
                    output.Write("Files=str.split('|');" + "rn");
                    output.Write("for (var i=0; i<Files.length;i++)" + "rn");
                    output.Write("{" + "rn");
                    output.Write("if (inputID == Files[i])" + "rn");
                    output.Write("{" + "rn");
                    output.Write("str=str.replace(inputID,"");" + "rn");
                    output.Write("obj.value=str;" + "rn");
                    output.Write("return;" + "rn");
                    output.Write("}" + "rn");
                    output.Write("}" + "rn");
                    output.Write("}" + "rn");
                    output.Write("}" + "rn");
                    output.Write("</script>" + "rn");
                    this.Page.ClientScript.RegisterClientScriptBlock(typeof(SheetAttachment), "SheetMultiAttachmentScript", "");
                }
                output.Write("<table width="100%" border="0">" + "rn");
                output.Write("<tr>" + "rn");
                output.Write("<td>" + "rn");
                output.Write("<table width="100%">" + "rn");
                output.Write("<tr>" + "rn");
                output.Write("<td>" + "rn");
                this.ListBox.RenderControl(output);
                output.Write("<input id="Button3" type="button" class="btn" value="删除" onclick="" + remove + "();"/>" + "rn");
                this.HiddenField.RenderControl(output);
                output.Write("</td>" + "rn");
                output.Write("</tr>" + "rn");
                output.Write("<tr>" + "rn");
                output.Write("<td>" + "rn");
                output.Write("<div id="" + files + "">" + "rn");
                this.FileUpload.ID = file + "0";
                this.FileUpload.RenderControl(output);
                output.Write("</div>" + "rn");
                output.Write("<input id="Button2" class="btn" type="button" value="添加文件" onclick="" + addinput + "();" />" + "rn");
                output.Write("</td>" + "rn");
                output.Write("</tr>" + "rn");
                output.Write("</table>" + "rn");
                output.Write("</td>" + "rn");
                output.Write("</tr>" + "rn");
                output.Write("</table>" + "rn");
                output.Write("</div>");
            }
        }
    }
}

						