(1)三个效果
1>传的参数较多,对数据表无要求,但可以设置下拉列的宽度和标题
2>传的参数很少,对数据表有要求(必须是处理好的)
3>传的参数一般,对数据表无要求,但不可以设置下拉列的宽度和标题
1)
2)
3)
(2)后台代码
底层类:
/// <summary> /// 初始化LookUpEdit控件 (加载数据表中的一列或多列,且显示下拉列标题,可以设置下拉列的宽度) /// </summary> /// <param name="lookUpEdit">空间名称</param> /// <param name="fields">下拉要显示的列</param> /// <param name="captions">下拉要显示的列标题</param> /// <param name="widths">下拉显示列的宽度 如果null 宽度为系统默认 </param> /// <param name="dt">绑定的数据表</param> /// <param name="valueMember">绑定列</param> /// <param name="displayMember">显示列</param> /// <param name="dropDownRows">下拉最多显示个数 如果为0,显示全部</param> public static void InitLookUpEdit(DevExpress.XtraEditors.LookUpEdit lookUpEdit, string[] fields, string[] captions, int[] widths, DataTable dt, string valueMember, string displayMember, int dropDownRows) { lookUpEdit.Properties.NullText = "---请选择---"; lookUpEdit.Properties.Columns.Clear(); if (fields.Length != captions.Length) { return; } for (int i = 0; i < fields.Length; i++) { if (widths != null) { if (fields.Length != widths.Length) { return; } lookUpEdit.Properties.Columns.Add(new DevExpress.XtraEditors.Controls.LookUpColumnInfo(fields[i], widths[i], captions[i])); lookUpEdit.Properties.Columns[i].Visible = widths[i] == 0 ? false : true; } else { lookUpEdit.Properties.Columns.Add(new DevExpress.XtraEditors.Controls.LookUpColumnInfo(fields[i], captions[i])); } lookUpEdit.Properties.Columns[i].Alignment = DevExpress.Utils.HorzAlignment.Center; } if (widths == null) lookUpEdit.Properties.Columns[valueMember].Visible = false; lookUpEdit.Properties.DataSource = dt; lookUpEdit.Properties.ValueMember = valueMember; lookUpEdit.Properties.DisplayMember = displayMember; lookUpEdit.Properties.ShowHeader = true; lookUpEdit.Properties.ShowFooter = false; if (dropDownRows == 0) { lookUpEdit.Properties.DropDownRows = dt.Rows.Count + 1; } else { lookUpEdit.Properties.DropDownRows = dt.Rows.Count > dropDownRows ? dropDownRows : dt.Rows.Count; } } /// <summary> /// 初始化LookUpEdit控件 (下拉加载数据表中的所有列,且不显示下拉列标题、不设置宽度) /// </summary> /// <param name="lookUpEdit">控件名称</param> /// <param name="dt">绑定的数据表</param> /// <param name="valueMember">绑定列</param> /// <param name="displayMember">显示列</param> /// <param name="dropDownRows">下拉最多显示个数 如果为0,显示全部</param> public static void InitLookUpEdit(DevExpress.XtraEditors.LookUpEdit lookUpEdit, DataTable dt, string valueMember, string displayMember, int dropDownRows) { if (!dt.Columns.Contains(valueMember) && dt.Columns.Contains(displayMember)) { return; } lookUpEdit.Properties.NullText = "---请选择---"; lookUpEdit.Properties.Columns.Clear(); foreach (DataColumn col in dt.Columns) lookUpEdit.Properties.Columns.Add(new DevExpress.XtraEditors.Controls.LookUpColumnInfo(col.ColumnName)); lookUpEdit.Properties.DataSource = dt; lookUpEdit.Properties.Columns[valueMember].Visible = false; lookUpEdit.Properties.ValueMember = valueMember; lookUpEdit.Properties.DisplayMember = displayMember; lookUpEdit.Properties.ShowHeader = false; lookUpEdit.Properties.ShowFooter = false; if (dropDownRows == 0) { lookUpEdit.Properties.DropDownRows = dt.Rows.Count; } else { lookUpEdit.Properties.DropDownRows = dt.Rows.Count > dropDownRows ? dropDownRows : dt.Rows.Count; } } /// <summary> /// 初始化LookUpEdit控件 (下拉加载数据表中一列或多列,且不显示下拉列标题、不设置宽度) /// </summary> /// <param name="lookUpEdit">控件名称</param> /// <param name="dt">绑定的数据表</param> /// <param name="fields">下拉要显示的列(要包含绑定列)</param> /// <param name="valueMember">绑定列</param> /// <param name="displayMember">显示列</param> /// <param name="dropDownRows">下拉最多显示个数 如果为0,显示全部</param> public static void InitLookUpEdit(DevExpress.XtraEditors.LookUpEdit lookUpEdit, DataTable dt, string[] fields, string valueMember, string displayMember, int dropDownRows) { //数据表中是否存在fields的列 if (fields != null) { for (int i = 0; i < fields.Length; i++) { if (!dt.Columns.Contains(fields[i])) { MessageBox.Show("LookUpEdit控件 列名不在数据表中"); return; } } } //过滤列 且去掉重复 DataView dv = new DataView(dt); dt = dv.ToTable(true, fields); InitLookUpEdit(lookUpEdit, dt, valueMember, displayMember, dropDownRows); }
调用:
//显示特定列 设置下拉列标题和宽度 InitLookUpEdit(lookUpEdit1, new string[] { "Stu_Number", "Stu_Name" }, new string[] { "学号", "姓名" }, new int[] { 50, 80 }, dt, "Stu_ID", "Stu_Name", 5); //显示全部列 不可以设置标题和宽度 InitLookUpEdit(lookUpEdit2, dt, "Stu_ID", "Stu_Name", 5); //显示特定列 不可以设置标题和宽度 InitLookUpEdit(lookUpEdit3, dt, new string[] { "Stu_Number", "Stu_Name", "Stu_ID" }, "Stu_ID", "Stu_Name", 5);
时间: 2024-08-01 23:51:53