C#下载csv代码总结(解决中文乱码问题)

2022-08-24 15:01:08 阅读：263 来源： 互联网

标签：cell string C# 乱码 whereQuery strLine new csv Response

/// <summary>
/// 下载
/// </summary>
/// <param name="startTime"></param>
/// <param name="endTime"></param>
public void Download(DateTime? startTime, DateTime? endTime)
{
Response<VSysLog> _rsp = new Response<VSysLog>();
try
{
using (NetEntities et = new NetEntities())
{
startTime = startTime == null ? DateTime.Now.AddMonths(-) : startTime.Value;
endTime = endTime == null ? DateTime.Now : endTime.Value;
int deviceType = (int)EnumDeviceType.网关设备;
//搜索条件
var whereQuery = PredicateExtensions.True<net_warninglog>();
//搜索条件---开始时间和结束时间
whereQuery = whereQuery.And(n => n.WarningTime >= startTime && n.WarningTime <= endTime);
//搜索条件---设备类型
whereQuery = whereQuery.And(n => n.DeviecType == deviceType);
//搜索条件---模糊查询
if (!string.IsNullOrEmpty(Request["condition"]))
{
string condition = Request["condition"];
whereQuery = whereQuery.And(n => n.WarningSource.Contains(condition));
}
List<VWarningLog> logList = et.net_warninglog.Where(whereQuery.Compile()).AsEnumerable().Select(n =>
new VWarningLog
{
id = n.ID,
warningName = n.WarningName,
warningReason = n.WarningReason,
deviceType = Enum.GetName(typeof(EnumDeviceType), n.DeviecType),
warningSource = n.WarningSource,
descr = n.Descr,
warningTime = n.WarningTime.ToString("yyyy-MM-dd HH:mm:ss")
}).OrderByDescending(x => x.warningTime).ToList();
System.IO.StringWriter sw = new StringWriter();
StringBuilder sbTitle = new StringBuilder();
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
//定义模版（标题、内容字段、格式化参数）
string[,] template = new string[,] {{ "终端编号,", "warningSource", "{0}"}, { "设备类型,", "deviceType", "{0}" }, { "报警原因,", "warningReason", "{0}"},
{ "报警信息,", "warningName", "{0}" }, { "描述", "descr", "{0}" }, { "报警时间", "warningTime", "{0}" } };
string strLine = "";
sw = new StringWriter();
//获取模板的行数
int colCount = template.GetLength();
//表头
for (int i = ; i < colCount; i++)
{
//在模板里面已经添加了逗号
strLine += template[i, ];
}
strLine.Remove(strLine.Length - );
sw.WriteLine(strLine);
strLine = "";
//表的内容
for (int j = ; j < logList.Count; j++)
{
strLine = "";
for (int k = ; k < colCount; k++)
{
if (k > && k < colCount)
{
strLine += ",";
}
string cell = "";
string data = string.Format(template[k, ], logList[j].GetType().GetProperty(template[k, ]).GetValue(logList[j], null));
if (string.IsNullOrEmpty(data))
{
strLine += "";
}
else
{
//前面加的单引号则是防止数字被转换成其它格式
cell = "'" + data.Trim();
}
//防止里面含有特殊符号
if (!string.IsNullOrEmpty(cell))
{
cell = cell.Replace("\"", "\"\"");
cell = "\"" + cell + "\"";
strLine += cell;
}
}
sw.WriteLine(strLine);
}
string attachment = "attachment; filename=" + DateTime.Now.ToString("yyyy年MM月dd日HH点") + "网关报警日志.csv";
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "text/csv";
Response.AddHeader("Pragma", "public");
Response.Charset = "UTF-8";
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.HeaderEncoding = System.Text.Encoding.UTF8;
//防止中文乱码(解决中文乱码问题)
Response.BinaryWrite(new byte[] { 0xEF, 0xBB, 0xBF });
response.Write(sw.ToString());
Response.End();
sw.Close();
}
}
catch (Exception ex)
{
_rsp.code = (int)EnumCode.程序异常;
_rsp.msg = ex.Message;
LogHelper.WriteLog(className, "Download", ex);
}
}

标签：cell,string,C#,乱码,whereQuery,strLine,new,csv,Response
来源： https://www.cnblogs.com/cuihongyu3503319/p/16619935.html

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C#下载csv代码总结(解决中文乱码问题)