目录
[Access] C#通过COM组件访问Access文件
access
com
d
文件
组件
访问
说明
通过
采用
说明： 1，采用dynamic调用COM组件，适用于.NET 4.0以上支持dynamic版本的才可以； 2，执行速度不敢恭维，只是因为要用于Silverlight OOB模式中才研究一二； 3，测试环境 .net 4.5 + Silverlight 5.0 + Visual Studio 2013 4，见如下helper类（需引用 using
说明：
1，采用dynamic调用COM组件，适用于.NET 4.0以上支持dynamic版本的才可以；
2，执行速度不敢恭维，只是因为要用于Silverlight OOB模式中才研究一二；
3，测试环境.net 4.5 + Silverlight 5.0 + Visual Studio 2013
4，见如下helper类（需引用using System.Runtime.InteropServices.Automation;）：
![[Access] C#通过COM组件访问Access文件](/inc/test.jsp?url=http%3A%2F%2Fimages.cnblogs.com%2FOutliningIndicators%2FContractedBlock.gif&refer=http%3A%2F%2Fwww.cnblogs.com%2Fmemento%2Fp%2F4272370.html)
![[Access] C#通过COM组件访问Access文件](/inc/test.jsp?url=http%3A%2F%2Fimages.cnblogs.com%2FOutliningIndicators%2FExpandedBlockStart.gif&refer=http%3A%2F%2Fwww.cnblogs.com%2Fmemento%2Fp%2F4272370.html)
<span> 1</span> <span>public</span> <span>class</span><span> SLAccessHelper
</span><span> 2</span> <span>{
</span><span> 3</span> <span>private</span> dynamic m_AccessApp;<span>//</span><span> Access.Application</span>
<span> 4</span> <span>private</span> dynamic m_Database;<span>//</span><span> Database</span>
<span> 5</span> <span>private</span><span> dynamic m_Recordset;
</span><span> 6</span>
<span> 7</span> <span>///</span> <span><summary></summary></span>
<span> 8</span> <span>///</span><span> 构造函数
</span><span> 9</span> <span>///</span> <span></span>
<span> 10</span> <span>///</span> <span><param name="visible"></span><span>Access是否可见</span><span></span>
<span> 11</span> <span>public</span> SLAccessHelper(<span>bool</span><span> visible)
</span><span> 12</span> <span> {
</span><span> 13</span> m_AccessApp = AutomationFactory.CreateObject(<span>"</span><span>Access.Application</span><span>"</span><span>);
</span><span> 14</span> m_AccessApp.Visible =<span> visible;
</span><span> 15</span> <span> }
</span><span> 16</span>
<span> 17</span> <span>///</span> <span><summary></summary></span>
<span> 18</span> <span>///</span><span> 打开数据库
</span><span> 19</span> <span>///</span> <span></span>
<span> 20</span> <span>///</span> <span><param name="filePath"></span><span>Access数据库文件路径</span><span></span>
<span> 21</span> <span>///</span> <span><param name="exclusive"></span><span>是否共享</span><span></span>
<span> 22</span> <span>///</span> <span><param name="bstrPassword"></span><span>密码</span><span></span>
<span> 23</span> <span>public</span> <span>void</span> OpenDb(<span>string</span> filePath, <span>bool</span> exclusive = <span>false</span>, <span>string</span> bstrPassword = <span>""</span><span>)
</span><span> 24</span> <span> {
</span><span> 25</span> <span> m_AccessApp.OpenCurrentDatabase(filePath, exclusive, bstrPassword);
</span><span> 26</span> m_Database =<span> m_AccessApp.CurrentDb();
</span><span> 27</span> <span> }
</span><span> 28</span>
<span> 29</span> <span>///</span> <span><summary></summary></span>
<span> 30</span> <span>///</span><span> 获取当前数据库中所有表名称集合
</span><span> 31</span> <span>///</span> <span></span>
<span> 32</span> <span>///</span> <span><returns></returns></span><span>所有表名称集合</span><span></span>
<span> 33</span> <span>public</span> Liststring><span> GetTableNames()
</span><span> 34</span> <span> {
</span><span> 35</span> Liststring> tableNames = <span>new</span> Liststring><span>();
</span><span> 36</span> dynamic tableDefs =<span> m_Database.TableDefs;
</span><span> 37</span> <span>foreach</span> (dynamic tableDef <span>in</span><span> tableDefs)
</span><span> 38</span> <span> {
</span><span> 39</span> <span> tableNames.Add(tableDef.Name);
</span><span> 40</span> <span> }
</span><span> 41</span>
<span> 42</span> <span>return</span><span> tableNames;
</span><span> 43</span> <span> }
</span><span> 44</span>
<span> 45</span> <span>///</span> <span><summary></summary></span>
<span> 46</span> <span>///</span><span> 加载表数据
</span><span> 47</span> <span>///</span> <span></span>
<span> 48</span> <span>///</span> <span><param name="tableName"></span><span>表名称</span><span></span>
<span> 49</span> <span>///</span> <span><returns></returns></span><span>表数据</span><span></span>
<span> 50</span> <span>public</span> List<list>string>> LoadTable(<span>string</span><span> tableName)
</span><span> 51</span> <span> {
</span><span> 52</span> dynamic recordSet =<span> m_Database.OpenRecordset(tableName);
</span><span> 53</span> <span>int</span> fieldsCount =<span> recordSet.Fields.Count;
</span><span> 54</span> List<list>string>> data = <span>new</span> List<list>string>><span>();
</span><span> 55</span> <span>if</span> (fieldsCount > <span>0</span><span>)
</span><span> 56</span> <span> {
</span><span> 57</span> <span>try</span>
<span> 58</span> <span> {
</span><span> 59</span> Liststring> fieldNames = <span>new</span> Liststring><span>();
</span><span> 60</span> <span>for</span> (<span>int</span> i = <span>0</span>; i )
<span> 61</span> <span> {
</span><span> 62</span> <span> fieldNames.Add(recordSet.Fields[i].Name);
</span><span> 63</span> <span> }
</span><span> 64</span> <span> data.Add(fieldNames);
</span><span> 65</span> <span>if</span> (!<span>recordSet.EOF)
</span><span> 66</span> <span> {
</span><span> 67</span> <span> recordSet.MoveFirst();
</span><span> 68</span> <span>while</span> (!<span>recordSet.EOF)
</span><span> 69</span> <span> {
</span><span> 70</span> <span>object</span>[] dataRow = recordSet.GetRows();<span>//</span><span> 返回一维数组</span>
<span> 71</span> Liststring> dataRowStr = <span>new</span> Liststring><span>();
</span><span> 72</span> <span>for</span> (<span>int</span> i = <span>0</span>; i )
<span> 73</span> <span> {
</span><span> 74</span> dataRowStr.Add(dataRow[i] == <span>null</span> ? <span>""</span><span> : dataRow[i].ToString());
</span><span> 75</span> <span> }
</span><span> 76</span> <span> data.Add(dataRowStr);
</span><span> 77</span> <span> }
</span><span> 78</span> <span> }
</span><span> 79</span> <span> }
</span><span> 80</span> <span>catch</span><span> (Exception ex)
</span><span> 81</span> <span> {
</span><span> 82</span> <span>throw</span> <span>new</span><span> Exception(ex.Message);
</span><span> 83</span> <span> }
</span><span> 84</span> <span>finally</span>
<span> 85</span> <span> {
</span><span> 86</span> <span>if</span> (recordSet != <span>null</span><span>)
</span><span> 87</span> <span> {
</span><span> 88</span> <span> recordSet.Close();
</span><span> 89</span> <span> ((IDisposable)recordSet).Dispose();
</span><span> 90</span> recordSet = <span>null</span><span>;
</span><span> 91</span> <span> }
</span><span> 92</span> <span> }
</span><span> 93</span> <span> }
</span><span> 94</span>
<span> 95</span> <span>return</span><span> data;
</span><span> 96</span> <span> }
</span><span> 97</span>
<span> 98</span> <span>///</span> <span><summary></summary></span>
<span> 99</span> <span>///</span><span> 添加新纪录
</span><span>100</span> <span>///</span> <span></span>
<span>101</span> <span>///</span> <span><param name="tableName"></span><span>表格名称</span><span></span>
<span>102</span> <span>///</span> <span><param name="data"></span><span>数据</span><span></span>
<span>103</span> <span>public</span> <span>void</span> AddNewRecord(<span>string</span> tableName, List<dictionary>string, <span>object</span>>><span> data)
</span><span>104</span> <span> {
</span><span>105</span> <span>try</span>
<span>106</span> <span> {
</span><span>107</span> m_Recordset = m_Database.OpenRecordset(tableName, <span>1</span>);<span>//</span><span> 1=RecordsetTypeEnum.dbOpenTable</span>
<span>108</span> <span>int</span> fieldsCount =<span> m_Recordset.Fields.Count;
</span><span>109</span> Liststring> fieldNames = <span>new</span> Liststring><span>();
</span><span>110</span> <span>for</span> (<span>int</span> i = <span>0</span>; i )
<span>111</span> <span> {
</span><span>112</span> <span> fieldNames.Add(m_Recordset.Fields[i].Name);
</span><span>113</span> <span> }
</span><span>114</span> <span>for</span> (<span>int</span> rowIndex = <span>0</span>; rowIndex )
<span>115</span> <span> {
</span><span>116</span> <span> m_Recordset.AddNew();
</span><span>117</span> <span>foreach</span> (<span>string</span> fieldName <span>in</span><span> fieldNames)
</span><span>118</span> <span> {
</span><span>119</span> m_Recordset.Fields[fieldName].Value =<span> data[rowIndex][fieldName];
</span><span>120</span> <span> }
</span><span>121</span> <span> m_Recordset.Update();
</span><span>122</span> <span> }
</span><span>123</span> <span> }
</span><span>124</span> <span>catch</span><span>(Exception ex)
</span><span>125</span> <span> {
</span><span>126</span> <span>throw</span> <span>new</span><span> Exception(ex.Message);
</span><span>127</span> <span> }
</span><span>128</span> <span>finally</span>
<span>129</span> <span> {
</span><span>130</span> <span>if</span> (m_Recordset != <span>null</span><span>)
</span><span>131</span> <span> {
</span><span>132</span> <span> m_Recordset.Close();
</span><span>133</span> <span> ((IDisposable)m_Recordset).Dispose();
</span><span>134</span> m_Recordset = <span>null</span><span>;
</span><span>135</span> <span> }
</span><span>136</span> <span> }
</span><span>137</span> <span> }
</span><span>138</span>
<span>139</span> <span>///</span> <span><summary></summary></span>
<span>140</span> <span>///</span><span> 更新表格数据
</span><span>141</span> <span>///</span> <span></span>
<span>142</span> <span>///</span> <span><param name="tableName"></span><span>表格名称</span><span></span>
<span>143</span> <span>///</span> <span><param name="data"></span><span>数据</span><span></span>
<span>144</span> <span>public</span> <span>void</span> UpdateTable(<span>string</span> tableName, List<dictionary>string, <span>string</span>>><span> data)
</span><span>145</span> <span> {
</span><span>146</span> <span>try</span>
<span>147</span> <span> {
</span><span>148</span> m_Recordset = m_Database.OpenRecordset(tableName, <span>1</span>);<span>//</span><span> 1=RecordsetTypeEnum.dbOpenTable</span>
<span>149</span> <span> m_Recordset.MoveFirst();
</span><span>150</span> <span>for</span> (<span>int</span> rowIndex = <span>0</span>; rowIndex )
<span>151</span> <span> {
</span><span>152</span> <span> m_Recordset.Edit();
</span><span>153</span> <span>foreach</span> (<span>string</span> fieldName <span>in</span><span> data[rowIndex].Keys)
</span><span>154</span> <span> {
</span><span>155</span> m_Recordset.Fields[fieldName].Value =<span> data[rowIndex][fieldName];
</span><span>156</span> <span> }
</span><span>157</span> <span> m_Recordset.Update();
</span><span>158</span> <span> m_Recordset.MoveNext();
</span><span>159</span> <span> }
</span><span>160</span> <span> }
</span><span>161</span> <span>catch</span><span> (Exception ex)
</span><span>162</span> <span> {
</span><span>163</span> <span>throw</span> <span>new</span><span> Exception(ex.Message);
</span><span>164</span> <span> }
</span><span>165</span> <span>finally</span>
<span>166</span> <span> {
</span><span>167</span> <span>if</span> (m_Recordset != <span>null</span><span>)
</span><span>168</span> <span> {
</span><span>169</span> <span> m_Recordset.Close();
</span><span>170</span> <span> ((IDisposable)m_Recordset).Dispose();
</span><span>171</span> m_Recordset = <span>null</span><span>;
</span><span>172</span> <span> }
</span><span>173</span> <span> }
</span><span>174</span> <span> }
</span><span>175</span>
<span>176</span> <span>///</span> <span><summary></summary></span>
<span>177</span> <span>///</span><span> 关闭
</span><span>178</span> <span>///</span> <span></span>
<span>179</span> <span>public</span> <span>void</span><span> Close()
</span><span>180</span> <span> {
</span><span>181</span> <span>if</span> (m_Database != <span>null</span><span>)
</span><span>182</span> <span> {
</span><span>183</span> <span> m_Database.Close();
</span><span>184</span> <span> ((IDisposable)m_Database).Dispose();
</span><span>185</span> m_Database = <span>null</span><span>;
</span><span>186</span> <span> }
</span><span>187</span> <span>if</span> (m_AccessApp != <span>null</span><span>)
</span><span>188</span> <span> {
</span><span>189</span> <span> m_AccessApp.CloseCurrentDatabase();
</span><span>190</span> <span>//</span><span> m_AccessApp.Quit();</span><span>//</span><span> 导致最后会弹出Access主页面</span>
<span>191</span> <span> ((IDisposable)m_AccessApp).Dispose();
</span><span>192</span> m_AccessApp = <span>null</span><span>;
</span><span>193</span> <span> }
</span><span>194</span> <span> GC.Collect();
</span><span>195</span> <span> }
</span><span>196</span> }</dictionary></dictionary></list></list></list>登录后复制
通过dynamic构建的COM对象，在使用完成后都要手动关闭销毁，比如代码中的m_AccessApp, m_Database, m_Recordset三个对象，否则只是将m_AccessApp关闭清空释放掉，Access进程还是无法关闭，在程序关闭之前，始终都会有一个空白的无法关闭的Access界面；
在循环中处理dynamic和C#类型转换会降低程序执行效率，就比如像GetTableNames方法中循环遍历表名，都要花两三秒时间，所以尽量像object[] dataRow = recordSet.GetRows();直接获取其中的所有数据，然后再遍历处理，会极大提高执行效率；
要修改Access中的数据时，一定要先m_Recordset.Edit();才会允许你编辑其中的内容；
本站声明
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn
热AI工具
Undresser.AI Undress
人工智能驱动的应用程序，用于创建逼真的裸体照片
AI Clothes Remover
用于从照片中去除衣服的在线人工智能工具。
Undress AI Tool
免费脱衣服图片
Clothoff.io
AI脱衣机
AI Hentai Generator
免费生成ai无尽的。
热门文章
R.E.P.O.能量晶体解释及其做什么（黄色晶体）
3 周前
By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O.最佳图形设置
3 周前
By 尊渡假赌尊渡假赌尊渡假赌
刺客信条阴影：贝壳谜语解决方案
2 周前
By DDD
R.E.P.O.如果您听不到任何人，如何修复音频
3 周前
By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25：如何解锁Myrise中的所有内容
3 周前
By 尊渡假赌尊渡假赌尊渡假赌
热工具
记事本++7.3.1
好用且免费的代码编辑器
SublimeText3汉化版
中文版，非常好用
禅工作室 13.0.1
功能强大的PHP集成开发环境
Dreamweaver CS6
视觉化网页开发工具
SublimeText3 Mac版
神级代码编辑软件(SublimeText3)
热门话题
Windows11怎么禁用后台应用程序_Windows11禁用后台应用教程
May 07, 2024 pm 04:20 PM
1、在Windows11中打开设置。您可以使用Win+I快捷方式或任何其他方法。2、转到应用程序部分，然后单击应用程序和功能。3、查找要阻止在后台运行的应用程序。单击三点按钮并选择高级选项。4、找到【后台应用程序权限】部分并选择所需的值。默认情况下，Windows11设置电源优化模式。它允许Windows管理应用程序在后台的工作方式。例如，一旦启用省电模式以保留电池，系统将自动关闭所有应用程序。5、选择【从不】可防止应用程序在后台运行。请注意，如果您注意到程序不向您发送通知、无法更新数据等，您可
deepseek怎么转换pdf
Feb 19, 2025 pm 05:24 PM
DeepSeek 无法直接将文件转换为 PDF。根据文件类型，可以使用不同方法：常见文档（Word、Excel、PowerPoint）：使用微软 Office、LibreOffice 等软件导出为 PDF。图片：使用图片查看器或图像处理软件保存为 PDF。网页：使用浏览器“打印成 PDF”功能或专用的网页转 PDF 工具。不常见格式：找到合适的转换器，将其转换为 PDF。选择合适的工具并根据实际情况制定方案至关重要。
field在java中是什么意思
Apr 25, 2024 pm 10:18 PM
在Java中，"field"是类或接口中的数据成员，用于存储数据或状态。field的属性包括：类型（可为任何Java数据类型）、访问权限、static（属于类而非实例）、final（不可变）和transient（不序列化）。field用于存储类或接口的状态信息，例如存储对象数据和维护对象状态。
oracle怎么读取dbf文件
May 10, 2024 am 01:27 AM
Oracle 可以通过以下步骤读取 dbf 文件：创建外部表，引用 dbf 文件；查询外部表，检索数据；将数据导入 Oracle 表。
Java反射机制如何修改类的行为？
May 03, 2024 pm 06:15 PM
Java反射机制允许程序动态修改类的行为，无需修改源代码。通过Class对象操作类，可以通过newInstance()创建实例，修改私有字段值，调用私有方法等。但应谨慎使用反射，因为它可能会导致意外的行为和安全问题，并有性能开销。
Java 函数开发中常见的异常类型及其修复措施
May 03, 2024 pm 02:09 PM
Java函数开发中常见的异常类型及其修复措施在Java函数开发过程中，可能遇到各种异常，影响函数的正确执行。以下是常见的异常类型及其修复措施：1.NullPointerException描述:当访问一个还未初始化的对象时抛出。修复措施:确保在使用对象之前对其进行非空检查。示例代码:try{Stringname=null;System.out.println(name.length());}catch(NullPointerExceptione){
vue中iframe跨域的方法
May 02, 2024 pm 10:48 PM
在 Vue 中解决 iframe 跨域问题的方法：CORS：启用后端服务器中的 CORS 支持，在 Vue 中使用 XMLHttpRequest 或 fetch API 发送 CORS 请求。JSONP：使用后端服务器中的 JSONP 端点，在 Vue 中动态加载 JSONP 脚本。代理服务器：设置代理服务器转发请求，在 Vue 中使用第三方库（如 axios）发送请求并设置代理服务器 URL。
解读 Botanix：网络资产管理去中心化的 BTC L2（附交互教程）
May 08, 2024 pm 06:40 PM
昨日，BotanixLabs宣布累计完成1150万美元融资，PolychainCapital、PlaceholderCapital等参投。融资将用于构建去中心化的EVM等效BTCL2Botanix。Spiderchain结合了EVM的易用性与比特币的安全性。自2023年11月测试网上线以来，已有超过20万个活跃地址。Odaily将于本文解析Botanix的特色机制与测试网交互流程。Botanix按照官方定义，Botanix是一个基于比特币构建的去中心化的图灵完备L2EVM，由两个核心组件以太坊虚
