blocks|key|3777879|text|string+col1Value+=+rdr["ColumnOneName"].ToString();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3777880|或|unstyled|3777881|string+col1Value+=+rdr[0].ToString();|3777882|这些是objects，所以您需要对它们进行强制转换或.ToString()。|offset|length|style|CODE|3777883|entityMap^0|0|0|0|3|6|Q|B|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|T|8|@$K|U|L|V|M|N]|$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|F|7|Y|8|@]|9|@]|A|$]]]|P|$]]

<pre><code>string col1Value = rdr["ColumnOneName"].ToString();
</code></pre>

or

<pre><code>string col1Value = rdr[0].ToString();
</code></pre>

These are <code>object</code>s, so you need to either cast them or <code>.ToString()</code>.

blocks|key|3777893|text|将从"ColumnName"所在的数据库返回的begin列的名称放入其中。如果是字符串，则可以使用.ToString()。如果是另一种类型，则需要使用System.Convert进行转换。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3777894|SqlDataReader+rdr+=+cmd.ExecuteReader();
while+(rdr.Read())
{
++++string+column+=+rdr["ColumnName"].ToString();
++++int+columnValue+=+Convert.ToInt32(rdr["ColumnName"]);
}|code-block|syntax|javascript|3777895|entityMap^0|2|C|1D|B|23|E|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

Put the name of the column begin returned from the database where <code>"ColumnName"</code> is. If it is a string, you can use <code>.ToString()</code>. If it is another type, you need to convert it using <code>System.Convert</code>.

<pre><code>SqlDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
 string column = rdr["ColumnName"].ToString();
 int columnValue = Convert.ToInt32(rdr["ColumnName"]);
}
</code></pre>

blocks|key|3777897|text|using(SqlDataReader+rdr+=+cmd.ExecuteReader())
{
++++while+(rdr.Read())
++++{
++++++++var+myString+=+rdr.GetString(0);+//The+0+stands+for+"the+0'th+column",+so+the+first+column+of+the+result.
++++++++//+Do+somthing+with+this+rows+string,+for+example+to+put+them+in+to+a+list
++++++++listDeclaredElsewhere.Add(myString);
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3777898|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>using(SqlDataReader rdr = cmd.ExecuteReader())
{
 while (rdr.Read())
 {
 var myString = rdr.GetString(0); //The 0 stands for "the 0'th column", so the first column of the result.
 // Do somthing with this rows string, for example to put them in to a list
 listDeclaredElsewhere.Add(myString);
 }
}
</code></pre>

blocks|key|1666689|text|最简单地说，如果您的查询返回column_name，并且包含一个字符串：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1666690|while+(rdr.Read())
{
++++string+yourString+=+rdr.getString("column_name")
}|code-block|syntax|javascript|1666691|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In the simplest terms, if your query returns column_name and it holds a string:

<pre><code>while (rdr.Read())
{
 string yourString = rdr.getString("column_name")
}
</code></pre>

blocks|key|1452680|text|实际上，我自己发现我可以做到：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1452681|while+(rdr.read())
{++
++string+str+=+rdr.GetValue().ToString().Trim();++
}|code-block|syntax|javascript|1452682|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Actually, I figured it out myself that I could do this:

<pre><code>while (rdr.read())
{ 
 string str = rdr.GetValue().ToString().Trim(); 
}
</code></pre>

blocks|key|5195660|text|while(rdr.Read())
{
+++string+col=rdr["colName"].ToString();
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5195661|它会起作用的|unstyled|5195662|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>while(rdr.Read())
{
 string col=rdr["colName"].ToString();
}
</code></pre>

it wil work

blocks|key|1452687|text|我有一个助手函数，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1452688|++public+static+string+GetString(object+o)
++++{
++++++++if+(o+==+DBNull.Value)
++++++++++++return+"";

++++++++return+o.ToString();
++++}|code-block|syntax|javascript|1452689|然后我使用它来提取字符串：|1452690|+tbUserName.Text+=+GetString(reader["UserName"]);|1452691|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I have a helper function like:

<pre><code> public static string GetString(object o)
 {
 if (o == DBNull.Value)
 return "";

 return o.ToString();
 }
</code></pre>

then I use it to extract the string:

<pre><code> tbUserName.Text = GetString(reader["UserName"]);
</code></pre>

blocks|key|1666916|text|对于单个结果：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1666917|if+(reader.Read())
{
++++Response.Write(reader[0].ToString());
++++Response.Write(reader[1].ToString());
}|code-block|syntax|javascript|1666918|对于多个结果：|1666919|while+(reader.Read())
{
++++Response.Write(reader[0].ToString());
++++Response.Write(reader[1].ToString());
}|1666920|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For a single result:

<pre><code>if (reader.Read())
{
 Response.Write(reader[0].ToString());
 Response.Write(reader[1].ToString());
}
</code></pre>

For multiple results:

<pre><code>while (reader.Read())
{
 Response.Write(reader[0].ToString());
 Response.Write(reader[1].ToString());
}
</code></pre>

blocks|key|3777977|text|我想把我的helper方法分享给那些可以使用它的人：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3777978|public+static+class+Sql
{
++++public+static+T+Read<T>(DbDataReader+DataReader,+string+FieldName)
++++{
++++++++int+FieldIndex;
++++++++try+{+FieldIndex+=+DataReader.GetOrdinal(FieldName);+}
++++++++catch+{+return+default(T);+}

++++++++if+(DataReader.IsDBNull(FieldIndex))
++++++++{
++++++++++++return+default(T);
++++++++}
++++++++else
++++++++{
++++++++++++object+readData+=+DataReader.GetValue(FieldIndex);
++++++++++++if+(readData+is+T)
++++++++++++{
++++++++++++++++return+(T)readData;
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++try
++++++++++++++++{
++++++++++++++++++++return+(T)Convert.ChangeType(readData,+typeof(T));
++++++++++++++++}
++++++++++++++++catch+(InvalidCastException)
++++++++++++++++{
++++++++++++++++++++return+default(T);
++++++++++++++++}
++++++++++++}
++++++++}
++++}
}|code-block|syntax|javascript|3777979|用法：|3777980|cmd.CommandText+=+@"SELECT+DISTINCT+[SoftwareCode00],+[MachineID]+
++++++++++++++++++++FROM+[CM_S01].[dbo].[INSTALLED_SOFTWARE_DATA]";
using+(SqlDataReader+data+=+cmd.ExecuteReader())
{
++++while+(data.Read())
++++{
++++++++usedBy.Add(
++++++++++++Sql.Read<String>(data,+"SoftwareCode00"),+
++++++++++++Sql.Read<Int32>(data,+"MachineID"));
++++}
}|3777981|帮助器方法转换为您喜欢的任何值，如果它不能转换或数据库值为NULL，则结果将为null。|3777982|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Thought to share my helper method for those who can use it:

<pre><code>public static class Sql
{
 public static T Read&lt;T&gt;(DbDataReader DataReader, string FieldName)
 {
 int FieldIndex;
 try { FieldIndex = DataReader.GetOrdinal(FieldName); }
 catch { return default(T); }

 if (DataReader.IsDBNull(FieldIndex))
 {
 return default(T);
 }
 else
 {
 object readData = DataReader.GetValue(FieldIndex);
 if (readData is T)
 {
 return (T)readData;
 }
 else
 {
 try
 {
 return (T)Convert.ChangeType(readData, typeof(T));
 }
 catch (InvalidCastException)
 {
 return default(T);
 }
 }
 }
 }
}
</code></pre>

Usage:

<pre><code>cmd.CommandText = @"SELECT DISTINCT [SoftwareCode00], [MachineID] 
 FROM [CM_S01].[dbo].[INSTALLED_SOFTWARE_DATA]";
using (SqlDataReader data = cmd.ExecuteReader())
{
 while (data.Read())
 {
 usedBy.Add(
 Sql.Read&lt;String&gt;(data, "SoftwareCode00"), 
 Sql.Read&lt;Int32&gt;(data, "MachineID"));
 }
}
</code></pre>

The helper method casts to any value you like, if it can't cast or the database value is NULL, the result will be null.

blocks|key|3777992|text|我知道这有点老了，但是如果你正在把一个SqlDataReader的内容读入一个类，那么这将是非常方便的。读取器和类的列名应该相同|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3777993|public+static+List<T>+Fill<T>(this+SqlDataReader+reader)+where+T+:+new()
++++++++{
++++++++++++List<T>+res+=+new+List<T>();
++++++++++++while+(reader.Read())
++++++++++++{
++++++++++++++++T+t+=+new+T();
++++++++++++++++for+(int+inc+=+0;+inc+<+reader.FieldCount;+inc%2B%2B)
++++++++++++++++{
++++++++++++++++++++Type+type+=+t.GetType();
++++++++++++++++++++string+name+=+reader.GetName(inc);
++++++++++++++++++++PropertyInfo+prop+=+type.GetProperty(name);
++++++++++++++++++++if+(prop+!=+null)
++++++++++++++++++++{
++++++++++++++++++++++++if+(name+==+prop.Name)
++++++++++++++++++++++++{
++++++++++++++++++++++++++++var+value+=+reader.GetValue(inc);
++++++++++++++++++++++++++++if+(value+!=+DBNull.Value)
++++++++++++++++++++++++++++{+
++++++++++++++++++++++++++++++++prop.SetValue(t,+Convert.ChangeType(value,+prop.PropertyType),+null);
++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++//prop.SetValue(t,+value,+null);

++++++++++++++++++++++++}
++++++++++++++++++++}
++++++++++++++++}
++++++++++++++++res.Add(t);
++++++++++++}
++++++++++++reader.Close();

++++++++++++return+res;
++++++++}|code-block|syntax|javascript|3777994|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I know this is kind of old but if you are reading the contents of a SqlDataReader into a class, then this will be very handy. the column names of reader and class should be same

<pre><code>public static List&lt;T&gt; Fill&lt;T&gt;(this SqlDataReader reader) where T : new()
 {
 List&lt;T&gt; res = new List&lt;T&gt;();
 while (reader.Read())
 {
 T t = new T();
 for (int inc = 0; inc &lt; reader.FieldCount; inc++)
 {
 Type type = t.GetType();
 string name = reader.GetName(inc);
 PropertyInfo prop = type.GetProperty(name);
 if (prop != null)
 {
 if (name == prop.Name)
 {
 var value = reader.GetValue(inc);
 if (value != DBNull.Value)
 { 
 prop.SetValue(t, Convert.ChangeType(value, prop.PropertyType), null);
 }
 //prop.SetValue(t, value, null);

 }
 }
 }
 res.Add(t);
 }
 reader.Close();

 return res;
 }
</code></pre>

blocks|key|1666998|text|我反对在这里使用SqlDataReader；ADO.NET有很多边缘情况和复杂性，根据我的经验，大多数手动编写的ADO.NET代码至少在一种方面(通常是微妙的和上下文相关的)被破坏了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1666999|有一些工具可以避免这种情况。例如，在这里的情况下，您希望读取一列字符串列。Dapper让这一切变得毫无痛苦：|1667000|var+region+=+...+//+some+filter
var+vals+=+connection.Query<string>(
++++"select+Name+from+Table+where+Region=@region",+//+query
++++new+{+region+}+//+parameters
).AsList();|code-block|syntax|javascript|1667001|Dapper在这里负责处理所有的参数化、执行和行处理-以及ADO.NET的许多其他繁琐的细节。可以用<SomeType>替换<string>以将整个行物化成对象。|1667002|entityMap|0|LINK|mutability|MUTABLE|url|https://www.nuget.org/packages/Dapper/^0|8|D|0|11|6|0|0|0|1E|A|1Q|8|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@$9|10|A|11|1|12]]|E|$]]|$1|H|3|I|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

I would argue against using <code>SqlDataReader</code> here; ADO.NET has lots of edge cases and complications, and in my experience most manually written ADO.NET code is broken in at least one way (usually subtle and contextual).

Tools exist to avoid this. For example, in the case here you want to read a column of strings. <a href="https://www.nuget.org/packages/Dapper/" rel="noreferrer">Dapper</a> makes that completely painless:

<pre><code>var region = ... // some filter
var vals = connection.Query&lt;string&gt;(
 "select Name from Table where Region=@region", // query
 new { region } // parameters
).AsList();
</code></pre>

Dapper here is dealing with all the parameterization, execution, and row processing - and a lot of other grungy details of ADO.NET. The <code>&lt;string&gt;</code> can be replaced with <code>&lt;SomeType&gt;</code> to materialize entire rows into objects.

blocks|key|1456988|text|我通常以这种方式通过数据读取器读取数据。只是添加了一个小示例。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1456989|string+connectionString+=+"Data+Source=DESKTOP-2EV7CF4;Initial+Catalog=TestDB;User+ID=sa;Password=tintin11#";
string+queryString+=+"Select+*+from+EMP";

using+(SqlConnection+connection+=+new+SqlConnection(connectionString))
using+(SqlCommand+command+=+new+SqlCommand(queryString,+connection))
++++++++++++{
++++++++++++++++connection.Open();

++++++++++++++++using+(SqlDataReader+reader+=+command.ExecuteReader())
++++++++++++++++{
++++++++++++++++++++if+(reader.HasRows)
++++++++++++++++++++{
++++++++++++++++++++++++while+(reader.Read())
++++++++++++++++++++++++{
++++++++++++++++++++++++++++Console.WriteLine(String.Format("{0},+{1}",+reader[0],+reader[1]));
++++++++++++++++++++++++}
++++++++++++++++++++}
++++++++++++++++++++reader.Close();
++++++++++++++++}
++++++++++++}|code-block|syntax|javascript|1456990|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I usually read data by data reader this way. just added a small example.

<pre><code>string connectionString = "Data Source=DESKTOP-2EV7CF4;Initial Catalog=TestDB;User ID=sa;Password=tintin11#";
string queryString = "Select * from EMP";

using (SqlConnection connection = new SqlConnection(connectionString))
using (SqlCommand command = new SqlCommand(queryString, connection))
 {
 connection.Open();

 using (SqlDataReader reader = command.ExecuteReader())
 {
 if (reader.HasRows)
 {
 while (reader.Read())
 {
 Console.WriteLine(String.Format("{0}, {1}", reader[0], reader[1]));
 }
 }
 reader.Close();
 }
 }
</code></pre>

blocks|key|3778032|text|你必须在这里read+database+column。你可以看看下面的代码片段|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3778033|++++++++++++++++string+connectionString+=+ConfigurationManager.ConnectionStrings["NameOfYourSqlConnectionString"].ConnectionString;
++++++++++++++++using+(var+_connection+=+new+SqlConnection(connectionString))
++++++++++++++++{
++++++++++++++++++++_connection.Open();

++++++++++++++++++++using+(SqlCommand+command+=+new+SqlCommand("SELECT+SomeColumnName+FROM+TableName",+_connection))
++++++++++++++++++++{

++++++++++++++++++++++++SqlDataReader+sqlDataReader+=+command.ExecuteReader();
++++++++++++++++++++++++if+(sqlDataReader.HasRows)
++++++++++++++++++++++++{
++++++++++++++++++++++++++++while+(sqlDataReader.Read())
++++++++++++++++++++++++++++{
++++++++++++++++++++++++++++++++string+YourFirstDataBaseTableColumn+=+sqlDataReader["SomeColumn"].ToString();+//+Remember+Type+Casting+is+required+here+it+has+to+be+according+to+database+column+data+type
++++++++++++++++++++++++++++++++string+YourSecondDataBaseTableColumn+=+sqlDataReader["SomeColumn"].ToString();
++++++++++++++++++++++++++++++++string+YourThridDataBaseTableColumn+=+sqlDataReader["SomeColumn"].ToString();

++++++++++++++++++++++++++++}
++++++++++++++++++++++++}
++++++++++++++++++++++++sqlDataReader.Close();
++++++++++++++++++++}
++++++++++++++++++++_connection.Close();|code-block|syntax|javascript|3778034|entityMap^0|6|4|B|F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

You have to <code>read</code> <code>database column</code>here. You could have a look on following code snippet 

<pre><code> string connectionString = ConfigurationManager.ConnectionStrings["NameOfYourSqlConnectionString"].ConnectionString;
 using (var _connection = new SqlConnection(connectionString))
 {
 _connection.Open();

 using (SqlCommand command = new SqlCommand("SELECT SomeColumnName FROM TableName", _connection))
 {

 SqlDataReader sqlDataReader = command.ExecuteReader();
 if (sqlDataReader.HasRows)
 {
 while (sqlDataReader.Read())
 {
 string YourFirstDataBaseTableColumn = sqlDataReader["SomeColumn"].ToString(); // Remember Type Casting is required here it has to be according to database column data type
 string YourSecondDataBaseTableColumn = sqlDataReader["SomeColumn"].ToString();
 string YourThridDataBaseTableColumn = sqlDataReader["SomeColumn"].ToString();

 }
 }
 sqlDataReader.Close();
 }
 _connection.Close();
</code></pre>

I have a SQL Server 2008 database and I am working on it in the backend. I am working on asp.net/C#

<pre><code>SqlDataReader rdr = cmd.ExecuteReader(); 
while (rdr.Read()) 
{ 
 //how do I read strings here???? 
} 
</code></pre>

I know that the reader has values. My SQL command is to select just 1 column from a table. The column contains strings ONLY. I want to read the strings (rows) in the reader one by one. How do I do this?

Read data from SqlDataReader

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我有一个SQL Server 2008数据库，我正在后端处理它。我正在研究asp.net/C#。SqlDataReader rdr = cmd.ExecuteReader();  while (rdr.Read())  {                 //how do I read strings here????...

问从SqlDataReader读取数据
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问从SqlDataReader读取数据EN