求教在将 varchar 值转换成数据类型 int 时失败
异常详细信息: System.Data.SqlClient.SqlException: 在将 varchar 值 'zhangsan' 转换成数据类型 int 时失败。

源错误:


行 92: string sql = "insert NewsRemark values(" + b + ",'" + a + "','" + this.txContent.Value.Trim() + "','" + DateTime.Now + "')";
行 93: SqlCommand com = new SqlCommand(sql, con);
行 94: com.ExecuteNonQuery();
行 95: Response.Write("<script>alert('发布成功！！');window.location.href='RemarkList.aspx?NewsID=" + b + "';</script>");
行 96: con.Close();


源文件: e:\新建文件夹\OATest\UserWork\NewsView.aspx.cs 行: 94

堆栈跟踪:


[SqlException (0x80131904): 在将 varchar 值 'zhangsan' 转换成数据类型 int 时失败。]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +1951450
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +4849003
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +194
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2394
System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async) +192
System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) +317
System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +137
UserWork_NewsView.bnSave_ServerClick(Object sender, EventArgs e) in e:\新建文件夹\OATest\UserWork\NewsView.aspx.cs:94
System.Web.UI.HtmlControls.HtmlInputButton.OnServerClick(EventArgs e) +111
System.Web.UI.HtmlControls.HtmlInputButton.RaisePostBackEvent(String eventArgument) +109
System.Web.UI.HtmlControls.HtmlInputButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565


源代码如下
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class UserWork_NewsView : System.Web.UI.Page
{
public string Titles;
public string TypeId;
public string Contents;
public string names;
public string Pubdate;
protected void Page_Load(object sender, EventArgs e)
{

if (!IsPostBack)
{
names = useram();
TypeId = TypeName();
int NewsID = Convert.ToInt32(Request["NewsID"].ToString());
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["Connection"]);
con.Open();
string sql = "select * from News where NewsID="+NewsID+" ";
SqlCommand com = new SqlCommand(sql,con);
SqlDataReader dr = com.ExecuteReader();
if (dr.Read())
{
Titles = dr["title"].ToString();
Contents = dr["Content"].ToString();
Pubdate=dr["Pubdate"].ToString();

}
con.Close();
}
}
public string useram()
{
string Re="";
int NewsID = Convert.ToInt32(Request["NewsID"].ToString());
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["Connection"]);
con.Open();
string sql = "select Name from Employee where Username=(select username from News where NewsID=" + NewsID + ")";
SqlCommand com = new SqlCommand(sql,con);
SqlDataReader dr = com.ExecuteReader();
if (dr.Read())
{
Re = dr["Name"].ToString();
}
return Re;

}
public string TypeName()
{


string Re="";
int NewsID = Convert.ToInt32(Request["NewsID"].ToString());
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["Connection"]);
con.Open();
string sql = "select type from NewsType where NTID=(select TypeId from news where NewsID=" + NewsID + ")";
SqlCommand com = new SqlCommand(sql,con);
SqlDataReader dr = com.ExecuteReader();
dr.Read();
return Re = dr["type"].ToString();

}
protected void bnSave_ServerClick(object sender, EventArgs e)
{
if (CheckBox1.Checked == true)
{
int b = Convert.ToInt32(Request["NewsID"].ToString());
string a = "署名";
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["Connection"]);
con.Open();
string sql = "insert NewsRemark values(" + b + ",'" + a + "','" + this.txContent.Value.Trim() + "','" + DateTime.Now + "')";
SqlCommand com = new SqlCommand(sql, con);
com.ExecuteNonQuery();
Response.Write("<script>alert('发布成功！！');window.location.href='RemarkList.aspx?NewsID=" + b + "';</script>");
con.Close();
}
else
{
int b = Convert.ToInt32(Request["NewsID"].ToString());
string a = Session["UserName"].ToString();
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["Connection"]);
con.Open();
string sql = "insert NewsRemark values(" + b + ",'" + a + "','" + this.txContent.Value.Trim() + "','" + DateTime.Now + "')";
SqlCommand com = new SqlCommand(sql, con);
com.ExecuteNonQuery();
Response.Write("<script>alert('发布成功！！');window.location.href='RemarkList.aspx?NewsID=" + b + "';</script>");
con.Close();
}

}

[解决办法]
string sql = "insert NewsRemark values(" + b + ",'" + a + "','" + this.txContent.Value.Trim() + "','" + DateTime.Now + "')";
你把你SQL语句要插入的字段在前面一一列出来
要插入的值 跟表字段值不一致 你插入的是STRING 而里头是INT
insert into NewRemark(field1,field2,...)values()
[解决办法]
string sql = "insert NewsRemark values(" + b + ",'" + a + "','" + this.txContent.Value.Trim() + "','" + DateTime.Now + "')";

强烈建议在插入的时候养成好的习惯，insert 表名后要跟上列名，这样对于你这样的错误可以迅速知道错误在哪，很明显你的a对应的NewsRemark的第二个列类型是int,而你的a是string类型